Medicine – Copper Metabolism and Wilson Disease

Wilson disease is an inherited disorder of copper metabolism in which the body cannot excrete copper normally into bile. Copper therefore progressively accumulates, particularly in the liver, brain, cornea and other tissues, producing hepatic, neurological, psychiatric and systemic manifestations.

The disorder is inherited in an:

Autosomal recessive – AR pattern.

1. Normal Copper Metabolism

Copper is an essential trace element obtained from the diet. After intestinal absorption, copper is transported to the:

Liver.

The liver has a central role in incorporating copper into proteins and eliminating excess copper from the body.

2. Ceruloplasmin

The original notes state that copper normally binds to a globulin to form:

Ceruloplasmin.

This is broadly correct, although the mechanism can be described more precisely.

Ceruloplasmin is a copper-containing plasma protein synthesised in the:

Liver.

Most circulating copper is carried bound to:

Ceruloplasmin.

3. Copper Excretion

The original notes correctly state that copper is predominantly excreted through:

Bile.

The liver secretes excess copper into bile, which passes into the intestine and is eventually eliminated in:

Faeces.

Urinary copper excretion is normally relatively small.

Therefore:

BILE IS THE MAJOR ROUTE OF COPPER EXCRETION.

4. Wilson Disease

Wilson disease results from pathogenic variants in the:

ATP7B gene.

ATP7B is located on:

Chromosome 13.

It encodes a copper-transporting ATPase that is particularly important in hepatocytes.

5. Inheritance

Wilson disease is:

Autosomal recessive.

Therefore an affected individual usually inherits a pathogenic ATP7B variant from:

Each parent.

Siblings of an affected patient may therefore require appropriate screening.

6. ATP7B Function

ATP7B normally has two particularly important functions:

It helps incorporate copper into ceruloplasmin.

and

It facilitates excretion of excess copper into bile.

When ATP7B function is defective, both processes are impaired.

7. Pathophysiology

The basic mechanism is:

ATP7B defect

↓

↓ biliary copper excretion

↓

Copper accumulates in hepatocytes

↓

Hepatic injury

↓

Copper eventually enters the circulation and deposits in other organs

↓

Brain + cornea + kidneys + joints + other tissues affected.

8. Important Correction About Ceruloplasmin

The original statement:

“Abnormality of ceruloplasmin formation and biliary excretion”

is broadly useful, but Wilson disease is fundamentally caused by:

Defective ATP7B-mediated copper transport.

The major problem responsible for copper overload is:

Impaired biliary copper excretion.

Ceruloplasmin is typically low because copper is not incorporated normally into apoceruloplasmin, which is then degraded more rapidly.

9. Liver Disease

The liver is often one of the first organs affected.

Wilson disease can produce a wide spectrum of hepatic disease, including:

Asymptomatic elevation of liver enzymes.

Acute hepatitis.

Chronic hepatitis.

Fibrosis.

Cirrhosis.

Acute liver failure.

Therefore Wilson disease should be considered particularly in a:

Young person with otherwise unexplained liver disease.

10. Acute Liver Failure

Wilson disease can occasionally present with:

Fulminant/acute liver failure.

This may be accompanied by:

Coombs-negative haemolytic anaemia.

Jaundice.

Coagulopathy.

Renal dysfunction.

This is a medical emergency.

11. Kayser–Fleischer Rings

The original notes correctly identify:

Kayser–Fleischer rings – KF rings

as a classic feature.

They result from copper deposition in:

Descemet membrane of the cornea.

12. Appearance of Kayser–Fleischer Rings

KF rings appear as:

Brownish, golden or greenish-brown rings

around the peripheral cornea.

They are best detected using:

Slit-lamp examination.

13. Significance of Kayser–Fleischer Rings

KF rings are particularly common in patients with:

Neurological Wilson disease.

However, an important point is:

ABSENCE OF KF RINGS DOES NOT EXCLUDE WILSON DISEASE.

They may be absent, particularly in patients presenting predominantly with hepatic disease.

14. Neurological Manifestations

Copper deposition in the brain, particularly the:

Basal ganglia,

can produce numerous neurological abnormalities.

Possible features include:

Tremor.

Dysarthria.

Dystonia.

Parkinsonian features.

Rigidity.

Bradykinesia.

Ataxia or impaired coordination.

Abnormal involuntary movements.

15. Tremor

A classic neurological manifestation is tremor.

A characteristic but not universal description is:

Wing-beating tremor.

This is a coarse proximal tremor that may become prominent when the arms are held out.

16. Psychiatric Manifestations

Psychiatric and behavioural changes are also important.

Patients may develop:

Personality change.

Irritability.

Depression.

Anxiety.

Behavioural deterioration.

Psychosis in some cases.

Declining school or work performance.

Therefore Wilson disease can initially appear to be a primary psychiatric or neurological disorder.

17. Arthropathy

The original notes correctly include:

Arthropathy.

Joint manifestations may include:

Joint pain.

Premature degenerative changes.

Arthritis-like symptoms.

Large joints such as the knees may be affected.

18. Haemolytic Anaemia

Wilson disease can cause:

Coombs-negative intravascular haemolytic anaemia.

This is particularly important during acute hepatic deterioration.

When damaged hepatocytes suddenly release large amounts of copper into the circulation, free copper can damage:

Red-cell membranes.

This produces:

Haemolysis.

19. Haemolysis – Note Form

Hepatocyte injury

↓

Sudden release of copper

↓

Free circulating copper rises

↓

RBC membrane injury

↓

Coombs-negative intravascular haemolysis.

Therefore:

YOUNG PATIENT + LIVER FAILURE + COOMBS-NEGATIVE HAEMOLYSIS → THINK WILSON DISEASE.

20. Other Manifestations

Copper accumulation can affect other organs.

Possible manifestations include:

Renal tubular dysfunction.

Nephrolithiasis.

Skeletal abnormalities.

Cardiac involvement, although less common.

The clinical presentation is highly variable.

21. Diagnosis of Wilson Disease

The diagnosis should not usually depend on one test alone.

Assessment combines:

Serum ceruloplasmin.

Urinary copper excretion.

Slit-lamp examination for KF rings.

Serum copper assessment in appropriate contexts.

Liver copper measurement when needed.

ATP7B genetic testing.

22. Serum Ceruloplasmin

The original notes correctly state:

Ceruloplasmin is usually low.

This is an important clue to Wilson disease.

However:

Low ceruloplasmin alone does not establish the diagnosis.

It can also occur in other conditions.

Conversely, some patients with Wilson disease may have ceruloplasmin values that are not markedly reduced.

23. Serum Copper – Important Paradox

A potentially confusing feature is that:

Total serum copper may be low

because most circulating copper is normally bound to ceruloplasmin, and ceruloplasmin is reduced.

However, the biologically important:

Non-ceruloplasmin-bound copper

may be increased.

Therefore:

LOW TOTAL SERUM COPPER DOES NOT EXCLUDE COPPER OVERLOAD IN WILSON DISEASE.

The problem is abnormal tissue accumulation and increased toxic circulating copper, not simply the total serum copper concentration.

24. Urinary Copper

The original notes correctly include:

High urinary copper.

Twenty-four-hour urinary copper excretion is typically increased because excess non-ceruloplasmin-bound copper becomes available for renal excretion.

Therefore:

WILSON DISEASE → ↑ URINARY COPPER.

25. Liver Biopsy

The original notes include:

Liver biopsy.

When required, hepatic copper concentration can be measured from biopsy tissue.

A markedly elevated hepatic copper concentration strongly supports:

Wilson disease.

However, liver biopsy is not necessary in every patient if the diagnosis can be established through biochemical, ophthalmological and genetic findings.

26. Genetic Testing

Modern evaluation may include:

ATP7B genetic testing.

Identification of pathogenic variants on both alleles can strongly support or establish the diagnosis in the appropriate clinical context.

Genetic testing is also useful for:

Family screening.

27. Brain Imaging

In patients with neurological disease, MRI may demonstrate abnormalities involving structures such as the:

Basal ganglia.

However, MRI findings are supportive rather than diagnostic by themselves.

28. Treatment

Wilson disease requires:

Lifelong management.

Treatment aims to reduce toxic copper accumulation and prevent further deposition.

Major approaches include:

Copper chelation.

Reduction of intestinal copper absorption.

Liver transplantation in selected severe disease.

29. Penicillamine

The original notes correctly identify:

D-penicillamine

as a copper-chelating drug.

It binds copper and promotes its elimination, particularly through:

Urine.

Therefore:

PENICILLAMINE + COPPER → CHELATED COPPER → ↑ URINARY EXCRETION.

30. Adverse Effects of Penicillamine

Penicillamine can cause significant adverse effects, including:

Bone-marrow suppression.

Proteinuria and renal toxicity.

Skin reactions.

Autoimmune complications.

Neurological symptoms can sometimes worsen after treatment initiation, so specialist monitoring is important.

31. Trientine

An important alternative copper chelator is:

Trientine.

It can be used as an alternative to penicillamine in appropriate patients and also increases:

Urinary copper excretion.

Modern Wilson disease management is therefore not limited to penicillamine alone.

32. Zinc Therapy

Zinc salts provide another treatment strategy.

Zinc reduces intestinal copper absorption by inducing intestinal:

Metallothionein.

Metallothionein binds copper within enterocytes.

The copper is then lost when the intestinal cells are shed.

Therefore:

ZINC → ↓ INTESTINAL COPPER ABSORPTION.

Zinc may be used in selected patients, including maintenance therapy depending on the clinical situation.

33. Liver Transplantation

The original notes correctly include:

Liver transplantation.

It is particularly important in:

Acute liver failure due to Wilson disease

and selected patients with:

Decompensated end-stage liver disease.

34. Why Liver Transplantation Is Particularly Effective

The liver contains the major defect in ATP7B-mediated copper handling.

Replacing the liver therefore restores:

Normal hepatic copper metabolism and biliary copper excretion.

Thus transplantation can effectively correct the underlying metabolic defect.

35. Dietary Considerations

During treatment, patients may be advised to avoid excessive intake of particularly copper-rich foods, especially early in therapy.

Examples can include:

Liver and organ meats.

Shellfish.

Some nuts and chocolate.

However, dietary restriction alone is:

Not adequate treatment for established Wilson disease.

36. Wilson Disease – Note Form

Inheritance:

Autosomal recessive.

Gene:

ATP7B.

Chromosome 13.

Normal physiology:

Copper transported to liver.

↓

Copper incorporated into ceruloplasmin.

↓

Excess copper excreted in bile.

Wilson disease:

ATP7B defect.

↓

↓ Copper incorporation into ceruloplasmin.

• ●

↓ Biliary copper excretion.

↓

Copper accumulation.

↓

Liver + brain + cornea + other organs.

37. Clinical Features – Note Form

Liver:

Acute hepatitis.

Chronic hepatitis.

Cirrhosis.

Acute liver failure.

Eye:

Kayser–Fleischer rings.

Copper deposited in Descemet membrane.

CNS:

Tremor.

Dystonia.

Dysarthria.

Parkinsonian features.

Movement abnormalities.

Psychiatric:

Personality change.

Depression.

Behavioural disturbance.

Psychosis in some cases.

Joints:

Arthropathy.

Blood:

Coombs-negative haemolytic anaemia.

38. Diagnosis – Note Form

Ceruloplasmin:

Usually ↓.

24-hour urinary copper:

↑.

Kayser–Fleischer rings:

Detected by slit lamp.

Liver copper:

↑ when measured.

ATP7B genetic testing:

Supports/confirms diagnosis in appropriate circumstances.

39. Treatment – Note Form

Penicillamine:

Copper chelator.

↓

↑ urinary copper excretion.

Trientine:

Alternative copper chelator.

↓

↑ urinary copper excretion.

Zinc:

↓ intestinal copper absorption.

Liver transplantation:

Acute liver failure or selected severe/decompensated liver disease.

↓

Corrects hepatic metabolic defect.

40. Important Corrections to the Original Notes

The original statement:

“Copper usually binds to globulin to form ceruloplasmin”

is better expressed as:

CERULOPLASMIN IS A COPPER-CONTAINING PROTEIN SYNTHESISED BY THE LIVER AND CARRIES MOST CIRCULATING COPPER.

The original statement:

“Abnormality of ceruloplasmin formation and biliary excretion”

is broadly correct, but the fundamental defect is:

ATP7B MUTATION → IMPAIRED COPPER INCORPORATION INTO CERULOPLASMIN + IMPAIRED BILIARY COPPER EXCRETION.

The impaired biliary excretion is particularly important for:

Progressive tissue copper accumulation.

Low ceruloplasmin is an important diagnostic clue but is:

Not diagnostic by itself.

High urinary copper is an important feature.

Liver biopsy can measure hepatic copper but is:

Not mandatory in every patient.

Treatment is broader than:

“Penicillamine + liver transplantation.”

Modern management may include:

PENICILLAMINE, TRIENTINE, ZINC, AND LIVER TRANSPLANTATION WHEN INDICATED.

Key Clinical Pattern

For rapid recall:

WILSON DISEASE = AR ATP7B DEFECT ON CHROMOSOME 13.

ATP7B DEFECT → ↓ BILIARY COPPER EXCRETION → COPPER ACCUMULATION.

Think:

LIVER → HEPATITIS / CIRRHOSIS / ACUTE LIVER FAILURE.

EYE → KAYSER–FLEISCHER RINGS.

BRAIN → TREMOR / DYSTONIA / PARKINSONISM / PSYCHIATRIC CHANGE.

JOINTS → ARTHROPATHY.

BLOOD → COOMBS-NEGATIVE HAEMOLYTIC ANAEMIA.

For diagnosis:

↓ CERULOPLASMIN + ↑ URINARY COPPER + KF RINGS ± ↑ HEPATIC COPPER + ATP7B TESTING.

For treatment:

CHELATE COPPER WITH PENICILLAMINE OR TRIENTINE → REDUCE ABSORPTION WITH ZINC → TRANSPLANT FOR SEVERE LIVER FAILURE.

Orthopaedic Surgery - Hand Anatomy and Examination

Basics

The hand is a highly specialized organ that provides strength, precision, sensation, grasp, and fine motor control, allowing complex activities ranging from heavy manual work to delicate manipulation.

Anatomically, the hand can be divided into volar (palmar) and dorsal surfaces.

Volar Anatomy

The volar aspect contains many of the major structures responsible for hand function, including the digital nerves, major vascular structures, flexor tendons, and intrinsic muscles.

Because these structures are closely packed together, even relatively small palmar lacerations may injure several important tissues simultaneously.

Bony Anatomy

The hand and wrist contain a complex arrangement of bones.

There are:

8 carpal bones, 5 metacarpals, and 14 phalanges.

Each finger contains a proximal, middle, and distal phalanx.

The thumb has only two phalanges: proximal and distal.

History

A thorough history should precede the physical examination.

Important information includes:

Hand dominance, occupation, previous hand injuries or operations, mechanism of trauma, duration of symptoms, and location and character of pain.

Functional complaints such as weakness, loss of grip, numbness, locking, instability, or difficulty with specific activities should also be documented.

General Examination Principles

Understanding normal hand anatomy and biomechanics is essential for identifying injury.

The examiner should use a consistent, systematic examination sequence so that important structures are not overlooked.

The opposite hand provides an extremely useful comparison with the patient’s normal anatomy, strength, motion, and joint laxity.

Inspection

The hand should first be observed at rest.

Resting Posture

The natural posture of the fingers should be assessed.

Abnormal finger position may indicate tendon rupture, nerve injury, fracture, dislocation, or joint contracture.

The normal flexor cascade should also be observed.

Deformity

The examiner should identify any gross angular, rotational, or joint deformity.

Rotational malalignment may become more obvious when the patient makes a fist.

Soft-Tissue Changes

Look for:

Swelling, bruising, erythema, wounds, scars, masses, muscle wasting, and skin abnormalities.

Nail and Fingertip Examination

The nail plate, nail folds, pulp, and surrounding soft tissues should be inspected for:

Subungual hematoma, nail-bed injury, infection, fingertip trauma, vascular compromise, or deformity.

Vascular Examination

Adequate perfusion should be confirmed in the hand and each individual digit.

Radial and Ulnar Arteries

The radial and ulnar arteries should be palpated at the wrist.

Doppler examination can be used if pulses are difficult to detect.

Digital Arteries

The digital arteries can be assessed with handheld Doppler when vascular injury is suspected.

Capillary Refill

Capillary refill should be tested in each finger.

Normal refill is generally less than approximately 2 seconds in a warm, well-perfused hand.

Additional Perfusion Assessment

When necessary, finger temperature and pulse oximetry may provide additional information about digital perfusion.

These measurements are particularly useful when vascular compromise is subtle.

Allen Test

The Allen test assesses patency of the radial and ulnar arteries and the completeness of the palmar arterial arch.

The patient repeatedly opens and closes the hand while the examiner compresses both the radial and ulnar arteries.

The hand is then opened and one artery is released.

Rapid return of color indicates adequate flow through that artery and the palmar arch.

The test is then repeated for the opposite artery.

Delayed or absent reperfusion suggests arterial obstruction or incomplete collateral circulation.

Neurologic Examination

Neurologic assessment should include both sensory and motor testing.

The median, ulnar, and radial nerves should be evaluated systematically.

Sensory Examination

Sensation can initially be tested with light touch.

Two-point discrimination provides a more detailed evaluation of digital nerve function.

Two-Point Discrimination

Normal static two-point discrimination at the fingertip is generally approximately 6 mm or less, while moving two-point discrimination is normally somewhat finer.

The result should be compared with the opposite hand and adjacent digits.

A bent paperclip or formal discriminator can be used when dedicated instruments are unavailable.

Motor Examination

Both the extrinsic muscles, originating in the forearm, and the intrinsic muscles, originating within the hand, should be tested.

Extrinsic Flexors

The flexor digitorum superficialis and flexor digitorum profundus tendons should be tested individually in each finger.

Flexor Digitorum Profundus

To test the FDP, hold the PIP joint in extension and ask the patient to flex the DIP joint.

Active DIP flexion indicates continuity of the profundus tendon.

Flexor Digitorum Superficialis

To isolate the FDS, hold the other fingers in extension and ask the patient to flex the finger being tested at the PIP joint.

Extrinsic Extensors

Finger extension at the MCP joints should be tested individually.

Thumb extension should also be assessed.

Weakness may reflect tendon injury or radial nerve dysfunction proximal to the hand.

Intrinsic Muscles

The intrinsic muscles can be assessed by asking the patient to flex the MCP joints while extending the interphalangeal joints.

Finger abduction and adduction should also be tested with the MCP joints extended.

Asking the patient to cross adjacent fingers can further assess intrinsic muscle function.

Median Nerve

Sensory Examination

Median nerve sensation should be tested over the palmar aspect of the thumb, index finger, middle finger, and radial half of the ring finger.

Thenar Eminence

Sensation over the thenar eminence is supplied by the palmar cutaneous branch of the median nerve, which branches proximal to the carpal tunnel.

This area should be tested separately.

Preserved thenar sensation despite numbness in the median-innervated digits can support localization of compression to the carpal tunnel.

Motor Examination

Palmar abduction of the thumb assesses the abductor pollicis brevis and is an important test of recurrent motor branch function of the median nerve.

Ulnar Nerve

Sensory Examination

Sensation should be tested over the little finger and ulnar half of the ring finger, including the volar fingertip.

Motor Examination

The ulnar nerve supplies most of the intrinsic muscles of the hand.

Motor function can be tested by asking the patient to abduct and adduct the fingers or cross the fingers.

Radial Nerve

Sensory Examination

Radial nerve sensation is best assessed over the dorsal first web space.

Motor Examination

The radial nerve does not provide meaningful intrinsic motor innervation within the hand itself.

Motor function is assessed through muscles in the forearm by testing wrist extension, MCP joint extension of the fingers, and thumb extension.

Bones, Tendons, and Ligaments

Every bone and major joint should be palpated systematically when trauma or localized pain is present.

Range of Motion

Both active and passive range of motion should be assessed.

Approximate normal values include:

Thumb IP joint: approximately 0–80° of flexion.

Thumb MCP joint: approximately 0–50° of flexion.

Finger DIP joints: approximately 0–70 to 90°.

Finger PIP joints: approximately 0–100° or slightly greater.

Finger MCP joints: approximately 0–90°.

Wrist flexion: approximately 80°.

Wrist extension: approximately 70°.

Normal motion varies among individuals, so comparison with the opposite side is valuable.

Joint Examination

Each joint should be assessed for:

Tenderness, swelling, effusion, bogginess, instability, crepitus, loss of motion, or hypermobility.

Collateral Ligaments

Excessive side-to-side laxity may indicate injury to a collateral ligament.

Stress testing should be performed carefully and compared with the opposite side.

Important Wrist Structures

Two common sources of wrist pathology are the scapholunate ligament and the triangular fibrocartilage complex (TFCC).

Scapholunate Ligament

The scapholunate interval should be palpated dorsally for tenderness, particularly after wrist trauma.

TFCC

The TFCC lies on the ulnar side of the wrist and contributes to distal radioulnar and ulnocarpal stability.

Tenderness in this region may indicate a TFCC injury.

Special Tests

Tinel Sign at the Carpal Tunnel

Percussion over the median nerve at the volar wrist may produce tingling, numbness, or electric sensations in the median nerve distribution.

A positive test supports median nerve irritation and may be seen in carpal tunnel syndrome.

Flexion-Compression Test

The examiner applies direct pressure over the carpal tunnel while the wrist is held in flexion.

Reproduction of numbness, tingling, or pain in the median distribution within approximately 30 seconds supports the diagnosis of carpal tunnel syndrome.

Phalen Test

The patient holds the wrists in maximal flexion, usually by placing the dorsal surfaces of the hands together.

Development of paresthesias in the median nerve distribution within approximately 60 seconds is considered a positive test.

Wrist Aspiration

Wrist aspiration may be performed when infection, crystal arthropathy, hemarthrosis, or another joint process is suspected.

Dorsal Approach

A common dorsal entry point is between the third extensor compartment, containing extensor pollicis longus, and the fourth compartment, containing extensor digitorum communis and extensor indicis proprius.

Lister’s tubercle can be used as a palpable landmark.

The radiocarpal joint is entered just distal to this region, with slight wrist flexion facilitating access.

Eichhoff Test

The Eichhoff maneuver is frequently, although inaccurately, referred to as the Finkelstein test.

The patient places the thumb within the fist, and the examiner then passively deviates the wrist toward the ulna.

Pain over the first dorsal extensor compartment, containing the abductor pollicis longus and extensor pollicis brevis, supports the diagnosis of de Quervain tenosynovitis.

The true Finkelstein maneuver is performed somewhat differently, but both tests stress the first extensor compartment.

Thumb CMC Grind Test

The thumb carpometacarpal joint is assessed by applying axial compression through the thumb metacarpal while rotating or grinding the joint.

Reproduction of pain, particularly with crepitus, is consistent with trapeziometacarpal or thumb CMC osteoarthritis.

Imaging

Plain Radiographs

The standard hand radiographic series includes:

AP or PA, oblique, and lateral views.

These films help identify fractures, dislocations, joint-space abnormalities, malalignment, and degenerative changes.

Lateral View

For evaluation of individual digits, the fingers may be splayed or separated on the lateral projection to prevent overlap and allow clearer visualization of each phalanx and joint.

General Examination Approach

A complete hand assessment should proceed systematically through:

Inspection, vascular examination, sensory testing, motor testing, tendon assessment, joint range of motion, ligament stability, palpation, special tests, and appropriate imaging.

Because the structures of the hand are small and closely related, comparison with the opposite hand and careful documentation are especially important for detecting subtle abnormalities.

.

Orthopaedic Surgery - Hamstring Strain

⸻

Basics

The hamstrings are a group of long muscles located in the posterior thigh. They extend from the pelvis toward the knee and play an important role in hip extension, knee flexion, gait, sprinting, and deceleration.

A hamstring strain is a stretch-induced or forceful contraction injury of the muscle-tendon unit.

The injury commonly occurs when the hamstrings are required to change rapidly from controlling limb motion eccentrically to generating force concentrically, particularly during sudden acceleration or deceleration.

⸻

Mechanism

Hamstring strains frequently occur during quick starts, sudden stops, sprinting, jumping, or other explosive movements that produce a powerful contraction while the muscle is lengthened.

⸻

Classification

Hamstring strains are traditionally divided into three grades according to severity.

⸻

Mild Strain

A mild strain produces pain and muscle spasm without a substantial structural tear.

There is minimal loss of strength and usually only mild functional limitation.

⸻

Moderate Strain

A moderate injury involves partial tearing of muscle fibers.

Pain is more pronounced, and measurable weakness and functional limitation are present.

⸻

Severe Strain

A severe injury represents a complete or near-complete tear of the muscle or tendon, sometimes including avulsion from its bony attachment.

Marked weakness and immediate loss of function are typical.

⸻

Limitations of Grading

Traditional strain grading provides a useful description of injury severity, but clinical classification systems do not consistently predict the exact time required for return to sport.

⸻

Prevention

Prevention programs focus on improving hamstring strength, flexibility, fatigue resistance, and neuromuscular control.

⸻

Stretching

Regular hamstring stretching may be beneficial, particularly as part of a structured conditioning program.

Stretching should be performed carefully when the muscles are fatigued.

⸻

Conditioning

Anaerobic interval training and sport-specific drills can improve the ability of the hamstrings to tolerate repeated high-speed loading.

⸻

Strengthening

Eccentric hamstring strengthening is particularly important because the hamstrings undergo substantial eccentric loading during sprinting and deceleration.

⸻

Epidemiology

Hamstring strains are among the most common injuries encountered in athletes.

They are particularly associated with sports requiring sprinting, jumping, kicking, sudden acceleration, and ballistic lower-extremity movements.

⸻

Frequency

Hamstring injuries have been reported to account for a substantial proportion of sports-related injuries, reaching approximately 29% in some athletic populations.

They account for approximately 12% of injuries among professional football players in some series.

⸻

Associated Sports

Activities commonly associated with hamstring injury include running, football, skiing, dancing, skating, jumping, and weight lifting.

⸻

Recurrence

Recurrence is a major clinical problem.

Approximately one-third of hamstring injuries may recur, particularly when return to sport occurs before full recovery of strength and flexibility.

⸻

Risk Factors

Important risk factors include:

Increasing age, previous hamstring injury, muscle weakness, imbalance between quadriceps and hamstring strength, reduced lower-extremity flexibility, impaired trunk or core stability, fatigue, and dehydration.

The strongest predictor of future hamstring injury is often a previous hamstring strain.

⸻

Anatomy and Pathophysiology

The principal hamstring muscles are the biceps femoris, semitendinosus, and semimembranosus.

⸻

Proximal Origin

The semitendinosus, semimembranosus, and long head of the biceps femoris originate from the ischial tuberosity.

The short head of the biceps femoris originates from the posterior femur rather than the pelvis.

⸻

Distal Insertions

The biceps femoris inserts primarily on the fibular head.

The semitendinosus inserts medially on the proximal tibia as part of the pes anserinus, while the semimembranosus inserts on the posteromedial proximal tibia.

⸻

Function

The hamstrings flex the knee and contribute to hip extension.

During running and gait, they contract eccentrically to decelerate knee extension and absorb kinetic energy.

⸻

Common Site of Injury

Muscle strain most often occurs near a musculotendinous junction, frequently involving the biceps femoris, especially during high-speed running.

⸻

Pediatric and Adolescent Considerations

In children and adolescents, the tendon may be stronger than the immature apophysis.

A forceful hamstring contraction can therefore produce an ischial tuberosity avulsion fracture rather than a purely tendinous injury.

⸻

Adult Considerations

In adults, the same mechanism may produce a partial or complete proximal hamstring tendon avulsion.

⸻

Etiology

Hamstring strains usually occur when the muscle is rapidly lengthened while simultaneously generating substantial force.

⸻

Predisposing Factors

Predisposing factors include:

Poor flexibility, inadequate warm-up, fatigue, dehydration, muscle weakness, impaired coordination between opposing muscle groups, and quadriceps-to-hamstring strength imbalance.

⸻

Common Injury Mechanisms

Typical mechanisms include:

Sprinting from starting blocks, clearing a hurdle, forceful jumping or take-off, sudden acceleration, rapid deceleration, and water-skiing falls.

⸻

Water-Skiing Injury

A classic water-skiing mechanism occurs when the hips are suddenly flexed while the knees remain extended, sometimes producing substantial proximal hamstring injury.

⸻

Associated Conditions

Hamstring injuries may coexist with other musculoskeletal problems, including lumbar strain and groin strain.

⸻

Diagnosis

⸻

History

The usual presentation is sudden posterior thigh pain during running, jumping, or another explosive activity.

⸻

Sudden Onset

Most patients describe an abrupt onset of pain and tenderness.

A smaller proportion may develop symptoms more gradually.

⸻

Pop

More severe injuries may be accompanied by a sudden pop or tearing sensation, followed by immediate weakness or inability to continue activity.

⸻

Signs and Symptoms

Common symptoms include:

Posterior thigh pain, tenderness, weakness, swelling, bruising, and difficulty walking or running.

Pain is generally aggravated by stretching the hamstrings or activating them against resistance.

⸻

Physical Examination

⸻

Gait

Patients may demonstrate a stiff-legged gait because they attempt to avoid simultaneous hip flexion and knee extension, which places the hamstrings on stretch.

⸻

Inspection

The posterior thigh should be examined for:

Swelling, bruising, ecchymosis, hematoma, contour abnormality, or a palpable defect.

Marked bruising may indicate a more substantial tear.

⸻

Palpation

The entire hamstring muscle-tendon complex should be palpated from the ischial tuberosity to the distal insertions.

The location of maximal tenderness helps identify the injured structure.

⸻

Resisted Knee Flexion

Pain or weakness with resisted knee flexion supports the diagnosis of hamstring injury.

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Resisted Hip Extension

Pain with resisted hip extension may also occur, especially with proximal injury.

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Stretch Testing

Passive hip flexion combined with knee extension stretches the hamstrings and may reproduce symptoms.

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Pathological Findings

The injury spectrum ranges from microscopic muscle-fiber disruption to a partial or complete tear of the biceps femoris, semitendinosus, semimembranosus, or associated tendons.

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Imaging

Imaging is not routinely required when the history and examination clearly indicate an uncomplicated muscle strain.

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Plain Radiographs

Radiographs should be obtained when fracture or avulsion is suspected.

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Pelvic Radiographs

In adolescents, pelvic radiographs may demonstrate an ischial tuberosity avulsion fracture.

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Knee Radiographs

If symptoms are concentrated near the distal biceps femoris insertion, knee radiographs may demonstrate an associated fibular head avulsion fracture.

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Femoral Radiographs

Plain films of the femur may be helpful when a fracture is suspected after significant trauma.

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MRI

MRI can define the location, extent, and severity of muscle or tendon injury.

It is particularly useful when a complete tendon avulsion, substantial tear, or alternative diagnosis is suspected.

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Stress Fracture

MRI can also differentiate a hamstring strain from an occult stress fracture.

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Bone Scintigraphy

Bone scintigraphy can help distinguish stress fracture from soft-tissue injury, although MRI is generally preferred when available.

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Differential Diagnosis

Important differential diagnoses include:

Acute fracture, stress fracture, muscle contusion, proximal hamstring tendon avulsion, ischial apophyseal avulsion, and other posterior thigh muscle injuries.

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Referred Pain

In more chronic or atypical presentations, referred symptoms from the lumbar spine or hip should also be considered.

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Treatment

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General Principles

Most musculotendinous hamstring strains are treated nonoperatively.

Treatment progresses through phases according to pain, strength, flexibility, and functional recovery rather than following a rigid timeline.

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Acute Phase

During approximately the first week, treatment focuses on controlling pain and swelling.

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Initial Measures

Relative rest, ice, compression, and elevation may be used during the early symptomatic period.

Gentle pain-free motion should begin as tolerated.

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Subacute Phase

As acute inflammation and pain improve, progressive rehabilitation begins.

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Concentric Strengthening

Concentric strengthening can be introduced gradually, together with low-impact cross-training.

Exercises should remain below the threshold that produces significant pain.

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Remodeling Phase

During subsequent weeks, rehabilitation emphasizes restoration of muscle length, strength, and neuromuscular control.

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Stretching

More progressive hamstring stretching can be introduced once acute pain has settled.

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Eccentric Strengthening

Eccentric strengthening is a central component of rehabilitation because the hamstrings must tolerate high eccentric loads during running.

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Agility and Trunk Stabilization

Progressive agility drills and core or trunk stabilization exercises are useful for restoring dynamic lower-extremity control.

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Functional Phase

Running and sport-specific training can resume gradually when the patient is pain free and has recovered adequate strength and motion.

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Return to Sport

Return should be based on functional criteria rather than time alone.

The patient should demonstrate full or near-full range of motion, minimal or no tenderness, symmetric strength, and the ability to sprint and perform sport-specific tasks without pain.

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Competitive Phase

Once full activity resumes, continued strengthening, flexibility training, and neuromuscular conditioning are important to reduce recurrence.

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Activity

Initial rest should be followed by a gradual progression of activity according to symptoms and functional recovery.

Premature return to sprinting increases the risk of reinjury.

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Physical Therapy

Physical therapy is useful for restoring motion, strength, flexibility, and sport-specific function.

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Ice Massage

Ice massage may be used for short-term symptomatic relief during the early phase.

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Therapeutic Modalities

Modalities such as ultrasound have historically been used, although rehabilitation should focus primarily on progressive exercise and functional restoration.

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Aquatic Exercise

Water-based exercise may permit range-of-motion and conditioning work while reducing loading on the injured muscle.

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Exercise Progression

Once soreness has improved, active range of motion can progress to resisted knee flexion, hip-extension exercises, eccentric loading, running drills, and sport-specific movements.

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Medication

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NSAIDs

NSAIDs such as ibuprofen or naproxen may provide short-term relief of pain and swelling.

They have not been shown to accelerate muscle healing and should be used primarily for symptomatic control.

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Acetaminophen

Acetaminophen may be used as an alternative analgesic.

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Biologic Treatments

Platelet-rich plasma and other biologic therapies have been investigated for hamstring injuries.

Evidence supporting routine use remains limited, and these treatments should not replace structured rehabilitation.

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Surgery

Surgery is generally not indicated for uncomplicated musculotendinous junction strains.

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Ischial Tuberosity Avulsion Fracture

Adolescent avulsion fractures require assessment of displacement and functional impairment.

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Displacement

Historically, displacement greater than approximately 2 cm has been considered a possible indication for operative fixation, particularly in active patients.

Significantly displaced fractures have a greater risk of painful nonunion and persistent functional limitation.

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Tendon Avulsion

Complete proximal hamstring tendon avulsions, particularly those involving multiple tendons with substantial retraction, may be considered for surgical repair.

Treatment depends on age, activity level, chronicity, degree of retraction, and functional deficit.

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Referral

Evidence of complete tendon rupture, proximal tendon avulsion, substantial weakness, or a significantly displaced ischial avulsion fracture should prompt referral to an orthopaedic sports-medicine specialist.

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Follow-Up

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Prognosis

Most hamstring strains heal successfully with appropriate rehabilitation.

Recovery time depends on injury severity, location, previous injury, and functional demands.

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Mild Strains

Mild strains may improve within several days to approximately 1 week.

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Moderate Strains

Moderate injuries may require approximately 1–3 weeks or longer, depending on the size and location of the tear.

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Severe Injuries

Severe injuries, tendon avulsions, or displaced ischial tuberosity avulsion fractures may require many weeks to several months before full return to high-level sport.

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Complications

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Recurrent Strain

Previous hamstring injury significantly increases the risk of another strain.

Recurrence is especially common when flexibility, eccentric strength, and sprinting capacity have not been fully restored.

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Chronic Weakness

A significant untreated tendon injury may lead to persistent weakness, reduced endurance, and difficulty with high-speed activity.

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Scar Formation

Healing may produce scar tissue that alters normal muscle-tendon mechanics and contributes to recurrent symptoms.

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Symptomatic Nonunion

Substantially displaced ischial tuberosity avulsion fractures may fail to unite and produce chronic pain, weakness, or sitting discomfort.

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Patient Monitoring

Patients should be followed according to symptom severity and athletic demands.

Monitoring should include pain, tenderness, range of motion, hamstring strength, gait, flexibility, running tolerance, and ability to perform sport-specific movements.

A long-term program of eccentric strengthening, flexibility work, trunk stabilization, and graded athletic conditioning should be continued after return to sport to reduce the risk of recurrence.

Orthopaedic Surgery - Hammer Toes

Basics

A hammer toe is a lesser-toe deformity characterized primarily by flexion at the proximal interphalangeal (PIP) joint.

The distal interphalangeal (DIP) joint is usually extended, while the metatarsophalangeal (MTP) joint may remain neutral or become mildly extended.

The deformity may be flexible or rigid.

Epidemiology

Hammer toes are common and may be present in up to approximately 20% of patients presenting with foot disorders.

They occur more frequently in females than males.

Prevention

Because constrictive footwear is a major contributing factor, prevention focuses on wearing shoes with a wide, deep toe box that allows adequate room for the lesser toes.

Shoes that compress the forefoot or force the toes into a flexed position should be avoided.

Etiology

The most common cause is poorly fitting footwear, particularly shoes with a narrow or shallow toe box.

Other associated causes include:

Neuromuscular disease, diabetes mellitus, inflammatory arthropathy, and previous compartment syndrome.

Pathophysiology

Hammer toe develops from an imbalance between the intrinsic and extrinsic muscles and tendons controlling the lesser toes.

Abnormal forces progressively alter PIP and MTP alignment.

Initially, the deformity may remain flexible, but chronic imbalance can lead to capsular contracture and a fixed rigid deformity.

Associated Conditions

Hammer toes frequently coexist with other forefoot abnormalities.

Hallux Valgus

A bunion or hallux valgus deformity may crowd the lesser toes and contribute to development or progression of hammer toe.

MTP Hyperextension

When substantial MTP dorsiflexion accompanies the deformity, the clinical pattern may overlap with a claw toe.

Diagnosis

Diagnosis is primarily clinical.

The examination should define the location of deformity, degree of flexibility, associated MTP instability, and the source of pain.

Signs and Symptoms

Dorsal PIP Prominence

A prominent PIP joint is usually visible over the dorsum of the affected toe.

This prominence may rub against footwear.

Erythema

Repeated shoe pressure may produce localized redness over the prominent joint.

Callus Formation

A painful dorsal callus or corn may develop because of chronic pressure between the PIP prominence and the shoe.

History

Patients commonly report pain over the dorsal PIP prominence, particularly when wearing closed shoes.

Symptoms often improve with wider footwear or removal of the shoe.

Metatarsalgia

Some patients also develop pain beneath the metatarsal heads because altered toe mechanics transfer pressure to the plantar forefoot.

Physical Examination

Flexibility

The examiner should determine whether the deformity is flexible or rigid.

A flexible hammer toe can be passively corrected toward normal alignment, whereas a rigid deformity cannot.

MTP Joint

The MTP joint should be examined for dorsal subluxation, instability, or fixed hyperextension.

MTP instability may influence both treatment and prognosis.

Hallux Valgus

The foot should be inspected for an associated bunion deformity because hallux valgus can worsen crowding of the lesser toes.

Skin

The dorsal PIP joint and plantar forefoot should be examined for calluses, corns, ulceration, erythema, and pressure-related skin breakdown.

This is particularly important in patients with diabetes or neuropathy.

Imaging

Plain radiographs may confirm the PIP flexion deformity and demonstrate associated abnormalities such as MTP subluxation, hallux valgus, or degenerative change.

Weight-bearing views are generally most useful when overall forefoot alignment is being assessed.

Differential Diagnosis

Claw Toe

A claw toe usually demonstrates MTP hyperextension with flexion of both the PIP and DIP joints.

The MTP abnormality is typically more pronounced than in an isolated hammer toe.

Mallet Toe

A mallet toe consists primarily of flexion at the DIP joint.

The PIP joint is usually relatively neutral.

Treatment

General Principles

Treatment is directed toward symptoms rather than appearance alone.

Initial management is usually nonoperative and aims to reduce pressure on the prominent toe, accommodate the deformity, and improve comfort.

Footwear Modification

Shoes with a wide and high toe box should be used to minimize pressure over the dorsal PIP joint.

Avoidance of tight or pointed shoes is an important part of treatment.

Flexible Hammer Toe

A flexible deformity may improve symptomatically with a Budin splint or similar toe-straightening device.

The splint helps hold the toe in a more extended position and decreases dorsal pressure.

Rigid Hammer Toe

When the deformity is rigid, correction with a splint is less effective.

Treatment focuses on reducing local pressure.

Padding

Doughnut-shaped pads, silicone gel sleeves, and other protective devices may decrease friction and pressure over the dorsal prominence.

Geriatric Considerations

Hammer toes are particularly common in older women.

Many elderly patients also have medical conditions that increase operative risk or impair wound healing.

Diabetes and Vascular Disease

In patients with diabetes mellitus, peripheral neuropathy, or peripheral vascular disease, nonoperative treatment should be maximized whenever possible.

Skin integrity must be monitored closely because pressure points can progress to ulceration.

Surgery

Surgery is considered when persistent pain, shoe intolerance, ulceration, or progressive deformity continues despite appropriate nonoperative treatment.

The procedure depends largely on whether the toe remains flexible or has become rigid.

Flexible Hammer Toe Surgery

A flexor-to-extensor tendon transfer may be used for selected flexible deformities.

The procedure redirects flexor force to help extend the PIP joint and rebalance the toe.

Rigid Hammer Toe Surgery

Rigid deformities usually require a bony procedure.

Resection Arthroplasty

One of the most commonly performed operations is resection arthroplasty of the distal portion of the proximal phalanx.

The toe may then be temporarily stabilized with a pin while the soft tissues heal in corrected alignment.

Intramedullary Implants

Intramedullary fixation devices have increasingly been used as alternatives to external pins.

Potential advantages include avoidance of an exposed pin and improved patient convenience, although implant-related complications can still occur.

PIP Arthrodesis

Fusion of the PIP joint is another common option for painful rigid hammer toe.

It can be used both for primary correction and for revision of recurrent deformity.

Referral

Patients whose symptoms persist despite shoe modification, padding, or splinting may benefit from surgical consultation.

Diabetes

Patients with diabetes, neuropathy, or threatened skin breakdown should be assessed early because progressive pressure may lead to neuropathic ulceration or infection.

Prognosis

Hammer toe deformities commonly progress gradually over time.

Flexible deformities may become rigid as soft tissues contract.

Pain, callus formation, and difficulty wearing shoes may increase as the deformity worsens.

Complications

Potential postoperative complications include:

Stiffness, wound infection, persistent pain, incomplete correction, implant irritation, and recurrence of deformity.

Patient Monitoring

Follow-up should assess pain, shoe tolerance, skin condition, callus formation, flexibility of the toe, MTP stability, and progression of deformity.

Patients with diabetes or neuropathy require particularly careful surveillance for pressure-related skin breakdown and ulceration.

Orthopaedic Surgery - Growth-Plate Injury

Basics

A growth-plate injury involves the physis, the cartilaginous region responsible for longitudinal growth of a child’s bone.

Not every physeal injury produces a growth abnormality. Most heal without long-term consequences, but injuries that significantly crush, displace, or destroy part of the growth plate may result in growth arrest, angular deformity, or limb-length discrepancy.

Common Sites

Physeal fractures occur most frequently in the long bones of growing children.

The growth plates most commonly injured include the:

Distal radius, distal tibia, phalanges, and proximal humerus.

Sites at Greatest Risk of Growth Disturbance

Although some physes are injured more frequently, the distal femoral and distal tibial physes are particularly important because injuries in these locations have a relatively high risk of subsequent growth disturbance.

Synonyms

Growth-plate injuries are also called physeal injuries or physeal fractures.

The term Salter-Harris fracture refers to the widely used classification system for traumatic injuries involving the physis.

Epidemiology

Physeal injuries account for approximately 15–30% of pediatric fractures.

They can occur throughout childhood but are particularly common during periods of rapid growth.

Age

Peak incidence generally occurs around 11–12 years in girls and 12–14 years in boys, corresponding approximately to the adolescent growth spurt.

Sex

Boys are affected more frequently overall, with some series reporting approximately twice as many injuries in boys as in girls.

Remaining Growth

Younger children have more growth remaining and therefore have a greater amount of potential deformity if a physeal arrest develops.

Conversely, a similar growth arrest occurring near skeletal maturity may have relatively little effect on final limb length or alignment.

Risk Factors

Adolescent boys are at increased risk because of their higher frequency of traumatic injuries during periods when the growth plate remains open.

Prevention of Sequelae

Early recognition of physeal damage may allow intervention before severe deformity develops.

Physeal Bar

A physeal bar is a bridge of bone that forms across part of an injured growth plate and can tether further growth.

If the bar is relatively small and the child has substantial growth remaining, surgical excision may allow more symmetric growth to resume.

Historically, bar resection has been considered when less than approximately 50% of the physis is involved, although candidacy also depends on bar location and remaining growth.

Other Corrective Options

When growth arrest has already produced substantial deformity, treatment may include:

Physeal bar resection, contralateral epiphysiodesis, ipsilateral hemiepiphysiodesis, corrective osteotomy, or limb-lengthening procedures.

Contralateral Epiphysiodesis

When a predictable limb-length discrepancy is expected, growth of the opposite limb may be intentionally slowed or stopped to improve final symmetry.

Etiology

Trauma is the most common cause of growth-plate injury.

Other processes may also damage the physis.

Nontraumatic Causes

Potential causes include:

Infection, tumor, medications or hormonal exposure, and severe thermal injury from excessive heat or cold.

Classification

The Salter-Harris classification is the standard system used to describe traumatic physeal fractures.

It is based on the relationship of the fracture line to the physis, metaphysis, and epiphysis.

Salter-Harris Type I

The fracture passes entirely through the physis, separating the epiphysis from the metaphysis without extending into either adjacent bone.

Because the germinal portion of the growth plate may remain intact, the prognosis is usually good after appropriate reduction.

Salter-Harris Type II

Type II is the most common physeal fracture pattern.

The fracture passes through the physis and then exits through the metaphysis, leaving a metaphyseal fragment attached to the epiphysis.

Salter-Harris Type III

The fracture passes from the physis through the epiphysis and into the joint surface.

Because it is intra-articular and crosses the growth plate, accurate reduction is important to restore both joint congruity and physeal alignment.

Salter-Harris Type IV

The fracture extends through the metaphysis, physis, and epiphysis, crossing the entire growth plate and entering the joint.

This pattern carries an increased risk of growth arrest and post-traumatic joint incongruity if reduction is inadequate.

Salter-Harris Type V

Type V represents a compression or crush injury of the physis.

It may be difficult to recognize on initial radiographs and is associated with a relatively high risk of premature growth arrest.

Rang Type VI

A so-called Type VI or Rang VI injury involves damage to the peripheral perichondral ring.

It is not part of the original Salter-Harris classification but may produce asymmetric growth and angular deformity.

Risk by Classification

In general, the risk of growth disturbance increases with increasing complexity of physeal injury.

Types III, IV, and V are particularly concerning because they either cross the articular surface, disrupt the germinal layer more extensively, or crush the physis.

Associated Injuries

Physeal trauma may occur with other injuries, including:

Ligament injury, neurovascular injury, and additional chest, abdominal, or head trauma in high-energy mechanisms.

Diagnosis

Accurate diagnosis requires knowledge of the normal appearance and timing of secondary ossification centers and physeal closure at each skeletal location.

A fracture may be difficult to identify if much of the epiphysis remains cartilaginous.

Signs and Symptoms

The most common findings are pain, swelling, and tenderness over the involved growth plate.

Visible deformity may be present if the fracture is displaced.

Lower-Extremity Injuries

Children with a lower-extremity physeal fracture may be unable or unwilling to bear weight.

Upper-Extremity Injuries

Upper-extremity fractures commonly produce pain, swelling, and reduced active range of motion.

Crepitus

Crepitus may occasionally be present but should not be deliberately elicited because repeated manipulation can worsen pain or displacement.

Physical Examination

The entire injured limb should be examined carefully.

Skin

The examiner should look for open wounds, abrasions, bruising, swelling, and skin compromise.

Any wound near a fracture should raise concern for an open injury.

Neurovascular Status

Distal pulses, capillary refill, sensation, and motor function should be documented before and after splinting or reduction.

Pathological Findings

The physis is organized into several histologic zones:

Resting zone, proliferative zone, hypertrophic zone, zone of provisional calcification, and adjacent metaphysis.

Site of Fracture Propagation

Many physeal fractures propagate through the relatively weak hypertrophic and provisional calcification regions.

Permanent Physeal Injury

Permanent growth disturbance may occur when the injury destroys growth-plate cells, causes marked displacement or malalignment of the physis, or produces a bony bridge across the plate.

Infection can similarly damage the growth plate and result in arrest.

Imaging

Plain Radiographs

Initial imaging should include AP and lateral radiographs of the involved region.

An oblique view may be useful when the fracture pattern remains unclear.

Comparison Views

Comparison with the opposite side may occasionally help in very young children, although this is not routinely required.

CT

CT is useful for complex fractures, particularly those with intra-articular extension, when precise definition of the fracture geometry is required for treatment planning.

It is especially valuable for Salter-Harris III and IV injuries around complex joints.

MRI

MRI is the most sensitive modality for evaluating established physeal damage, occult physeal injury, and physeal bars.

It clearly demonstrates cartilage and can distinguish the growth plate from surrounding bone.

Acute MRI Findings

Possible findings include:

Physeal widening, increased fluid-sensitive signal within the injured physis, and adjacent bone marrow edema.

Physeal Bar Mapping

MRI can define the size, position, and percentage of physeal involvement by a bony bridge.

Three-dimensional or semiautomated mapping may assist prognosis and surgical planning.

Ultrasound

Ultrasound can be useful in infants and very young children because substantial portions of the epiphysis remain cartilaginous and may not be visible on conventional radiographs.

Differential Diagnosis

In acute trauma, the primary concern is identifying whether the injury truly involves the physis.

In chronic cases, other causes of growth-plate damage must be considered.

Infection

Physeal or metaphyseal infection may be insidious and can produce growth disturbance long after the initial illness.

Other Causes

Tumor, metabolic disease, previous surgery, radiation, thermal injury, and prior trauma may also cause physeal arrest.

Treatment

Initial Measures

Immediate management includes immobilization, elevation, ice when appropriate, pain control, and assessment of neurovascular status.

Nondisplaced Fractures

Nondisplaced physeal fractures should be immobilized promptly in an appropriate splint.

Displaced Fractures

Displaced injuries generally require reduction under suitable analgesia or anesthesia.

Options may include procedural sedation, regional or hematoma block in appropriate fractures, or general anesthesia.

After reduction, the limb is splinted and repeat imaging is obtained to confirm alignment.

Early Follow-Up

Patients with physeal fractures should usually be reviewed within approximately 3–5 days, particularly when substantial swelling is present.

Splint to Cast Conversion

A splint is often used initially because it accommodates swelling.

After edema has decreased, commonly after approximately 1–2 weeks, a circumferential cast may be applied if continued immobilization is required.

Weight Bearing

Lower-extremity physeal fractures are often treated with restricted or non-weight bearing until adequate stability and healing are demonstrated.

Upper-extremity injuries are generally protected with a sling or other supportive device.

Duration of Immobilization

Many uncomplicated physeal fractures heal relatively quickly because of the vascularity and remodeling potential of children.

Immobilization frequently lasts approximately 3–4 weeks, although duration varies substantially by age, fracture location, stability, and treatment method.

Medication

Analgesia should be provided according to pain severity.

Persistent or escalating pain should prompt reassessment for complications such as compartment syndrome rather than simply increasing medication.

Surgery

Goal of Reduction

Restoring appropriate alignment is one of the most important methods of reducing the risk of later deformity.

For intra-articular physeal injuries, restoration of the joint surface is also essential.

Repeated Reduction Attempts

Repeated forceful reduction attempts should be avoided because additional manipulation may further injure the growth plate.

Delayed Reduction

Forceful closed reduction performed more than approximately 5–7 days after injury is generally avoided in many physeal fractures because healing has already begun and manipulation may damage the physis.

Management should instead be individualized according to deformity, fracture type, and remaining growth.

Open Reduction

Salter-Harris III and IV fractures may require open reduction when acceptable anatomic alignment cannot be achieved by closed techniques.

Internal Fixation

Fractures that remain unstable after reduction may require percutaneous pinning, screws, or other internal fixation.

Crossing the Physis

When fixation must cross an open physis, smooth pins placed as centrally and perpendicularly as practical are generally preferred because they minimize physeal injury.

Eccentric or threaded implants crossing the physis may increase the risk of growth disturbance.

Open Fractures

Open physeal fractures require urgent antibiotics, tetanus assessment, surgical irrigation and debridement, stabilization, and orthopaedic management.

Follow-Up

Prognosis

Most growth-plate fractures heal without major difficulty.

The likelihood of growth disturbance depends on fracture type, anatomic location, degree of displacement, quality of reduction, patient age, and extent of physeal injury.

Effect of Salter-Harris Type

Higher-grade Salter-Harris injuries generally have a greater risk of subsequent growth abnormality.

Effect of Skeletal Maturity

The closer the patient is to skeletal maturity, the less remaining growth exists and therefore the smaller the potential effect of a growth arrest on final limb length.

High-Risk Anatomic Sites

The distal femoral and distal tibial physes have relatively high rates of growth disturbance and warrant particularly careful follow-up.

Lower-Risk Sites

The distal radius and proximal humerus often tolerate physeal injury better because of their substantial remodeling potential and the pattern of growth at those sites, although growth arrest can still occur.

Complications

Growth Arrest

A portion or all of the physis may stop growing prematurely.

Complete arrest can produce limb shortening, whereas partial arrest may create progressive angular deformity.

Growth Disturbance

Asymmetric growth across an injured physis may result in varus, valgus, flexion, extension, or rotational deformity, depending on the location of the arrest.

Limb-Length Discrepancy

Loss of growth from a major physis may produce clinically significant shortening of the affected limb.

Malunion

A fracture that heals in poor alignment may produce deformity even without a true growth arrest.

Growth Acceleration

Children younger than approximately 10 years may occasionally demonstrate temporary overgrowth after fracture because of increased local blood flow and stimulation of growth.

The resulting length increase is usually modest, often approximately 5–10 mm.

Patient Monitoring

Children at increased risk of growth disturbance require prolonged surveillance.

This includes Salter-Harris III–V fractures and all significant distal femoral or distal tibial physeal injuries.

Duration

Follow-up should generally continue for at least 6–12 months, and longer when substantial growth remains or there is concern for partial arrest.

Clinical Assessment

The physician should compare limb lengths, angular alignment, gait, and joint motion.

Radiographic Assessment

Follow-up radiographs should assess whether the growth plate remains open and symmetric.

A growth-arrest line, sometimes called a Harris line, may form after the injury.

If subsequent growth is normal, this line should progressively move away from the physis in a parallel and symmetric fashion.

Failure of the line to migrate normally, or asymmetric tethering toward one side of the physis, may suggest developing growth arrest.

Orthopaedic Surgery - Growing Pains

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Basics

Growing pains are a common, benign, noninflammatory pain syndrome of childhood characterized by recurrent episodes of lower-extremity discomfort without objective musculoskeletal abnormalities.

Despite the name, the condition has not been shown to result directly from periods of rapid skeletal growth.

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Typical Pattern

The pain usually occurs after active days and is most prominent during the late afternoon, evening, or nighttime.

Children may occasionally awaken from sleep because of the discomfort.

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Resolution of Episodes

Each episode resolves completely.

The child is generally normal and pain free between episodes.

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Location

Symptoms occur predominantly in the lower extremities and may involve one or both legs.

Pain is usually vague rather than sharply localized.

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Frequency

Episodes occur unpredictably.

Pain-free intervals may last days, weeks, or even months.

Some severely affected children may experience symptoms almost daily.

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Physical Findings

Growing pains produce no persistent objective abnormalities.

There should be no focal tenderness, swelling, joint restriction, weakness, or limp.

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Synonyms

Other terms include benign nocturnal limb pains of childhood, leg aches, and night pains.

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Epidemiology

Growing pains are very common.

Approximately 15–36% of children are reported to experience symptoms consistent with this syndrome at some point.

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Age

The condition most commonly affects children between approximately 4 and 14 years of age.

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Sex

Girls may be affected slightly more often than boys.

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Risk Factors

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High Activity Level

Symptoms are frequently reported in otherwise healthy, highly active children.

Episodes may be more noticeable after days involving substantial running, jumping, or sports participation.

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Family History

A positive family history is common.

A parent or sibling has been reported to have experienced similar childhood pains in nearly 70% of cases in some series.

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Etiology

The precise mechanism remains uncertain.

The disorder has been proposed to represent a form of relative musculoskeletal overuse or stress-related pain in otherwise normal children.

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Possible Contributing Factors

Proposed contributors include increased physical activity, relatively reduced bone strength, altered pain perception, and a lower pain threshold.

None of these explanations completely accounts for the syndrome.

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Diagnosis

Growing pains are a clinical diagnosis of exclusion.

The history and examination must be typical, and findings suggesting infection, inflammatory disease, malignancy, neurologic disease, or structural orthopaedic pathology should be absent.

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Signs and Symptoms

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Relationship to Activity

Pain frequently occurs after periods of increased activity.

Symptoms most often develop in the evening or at night.

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Nocturnal Pain

Children may awaken because of discomfort, although they should return to normal function afterward.

Persistent morning pain is not typical.

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Duration

Individual attacks may last from several minutes to several hours.

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Laterality

Pain is commonly bilateral, although episodes may occasionally affect only one leg at a particular time.

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Character

The pain is generally diffuse, vague, and poorly localized, often involving the calves, thighs, shins, or region behind the knees.

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Severity

Pain intensity varies considerably.

Some children describe only mild aching, whereas others experience episodes severe enough to cry or awaken from sleep.

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Episodic Course

A characteristic feature is the presence of completely pain-free intervals.

This episodic pattern helps distinguish growing pains from many inflammatory, infectious, neoplastic, or structural disorders.

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Physical Examination

A careful examination is essential because growing pains should not produce abnormal findings.

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Observation of Gait

The child should be observed walking naturally, preferably before becoming aware that gait is being assessed.

There should be no limp, stiffness, guarding, or reluctance to bear weight.

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Palpation

The lower extremities should be palpated systematically.

Growing pains should not produce focal bony, muscular, or joint-line tenderness.

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Range of Motion

Range of motion of the hips, knees, and ankles should be full and symmetric.

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Hip Examination

Particular attention should be given to the hips because hip disease may initially present as vague thigh or knee pain.

Gentle internal and external rotation of the hip, sometimes called the roll test or log-roll test, should not produce guarding or restriction.

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General Findings

There should be no swelling, erythema, warmth, muscle wasting, weakness, neurologic deficit, or systemic illness.

Any such finding should prompt investigation for another diagnosis.

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Laboratory Tests

Routine laboratory testing is not necessary when the history and physical examination are entirely typical.

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Atypical Presentation

If the history is unusual or concerning, investigations may include a complete blood count and inflammatory markers such as ESR and/or C-reactive protein.

Further testing should be directed toward the suspected alternative diagnosis.

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Imaging

Routine imaging is unnecessary for classic growing pains.

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Plain Radiographs

Radiographs may be obtained when pain is persistently localized, unilateral, associated with trauma, or accompanied by an abnormal examination.

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Advanced Imaging

Bone scintigraphy or other advanced imaging may occasionally help localize an occult source of pain when the clinical picture is atypical.

MRI is often preferred when an occult infection, stress injury, tumor, or inflammatory condition is suspected.

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Differential Diagnosis

Because growing pains are a diagnosis of exclusion, important alternative causes of childhood limb pain include:

Legg-Calvé-Perthes disease, chronic or subacute osteomyelitis, leukemia, sickle cell disease, juvenile idiopathic arthritis, Lyme disease, Osgood-Schlatter disease in older children, restless legs syndrome, and muscle cramps.

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Other Concerning Diagnoses

Depending on the clinical setting, stress fracture, bone tumor, inflammatory arthropathy, infection, trauma, neurologic disease, and referred hip pain should also be considered.

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Red Flags

Findings that are inconsistent with typical growing pains include persistent unilateral pain, focal tenderness, swelling, warmth, morning stiffness, joint restriction, limp, weakness, fever, weight loss, fatigue, night sweats, or progressively worsening symptoms.

These findings require further evaluation.

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Treatment

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Reassurance

Once the diagnosis is reasonably established, the most important treatment is reassurance of the child and family.

The condition is benign and does not damage bones, joints, or muscles.

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Stretching

A regular stretching program may decrease the frequency of symptoms.

Useful stretches target the hamstrings, quadriceps, and calf muscles, particularly before bedtime.

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Home Program

The stretching program can usually be performed with parental supervision and does not require formal physical therapy.

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Activity Modification

Most children can remain active.

If symptoms become frequent or severe, temporary reduction of particularly strenuous activities may help bring discomfort into a tolerable range.

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Orthoses

In selected children with substantial foot pronation or other biomechanical abnormalities, shoe inserts or orthotic devices may be considered.

However, orthoses are not routinely required for children with otherwise typical growing pains.

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Physical Therapy

Formal physical therapy is generally unnecessary.

It may be helpful when flexibility is poor, symptoms persist despite a home stretching program, or another biomechanical problem is present.

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Medication

Simple analgesics may be used occasionally for troublesome episodes.

Examples include acetaminophen or NSAIDs when appropriate.

Continuous routine medication is usually unnecessary.

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Follow-Up

Children with a completely typical presentation generally require only limited follow-up.

Repeated visits may sometimes be useful when the diagnosis remains uncertain or when the evolving pattern of symptoms needs to be observed.

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Prognosis

The prognosis is excellent.

Growing pains almost always resolve spontaneously as the child matures, without permanent musculoskeletal consequences.

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Patient Monitoring

Parents should monitor the character, frequency, location, and timing of pain.

A simple symptom diary may be useful when episodes are frequent.

The stretching program can be continued, and activity may be adjusted according to symptom severity.

Reevaluation is appropriate if the pattern changes or if the child develops persistent focal pain, swelling, limp, fever, morning symptoms, weakness, or other objective abnormalities.

Orthopaedic Surgery - Giant Cell Tumor

Basics

Giant cell tumor of bone is a benign but frequently locally aggressive primary bone neoplasm characterized histologically by numerous evenly distributed osteoclast-like multinucleated giant cells within a background of proliferating mononuclear stromal cells.

Although histologically benign in most cases, the tumor can behave aggressively, destroy surrounding bone, extend into soft tissues, recur after treatment, and rarely metastasize.

Typical Location

Giant cell tumors usually occur near the articular end of a long bone in skeletally mature patients.

Approximately half arise around the knee, particularly in the distal femur and proximal tibia.

Other common sites include the:

Distal radius, proximal femur, proximal humerus, distal tibia, and sacrum.

Flat Bones

When flat bones are affected, the sacrum and pelvis are the most common locations.

Giant cell tumors associated with Paget disease may involve flat bones, including the craniofacial skeleton.

Multifocal Disease

Multifocal giant cell tumor is rare.

Most patients have a single lesion.

Classification

The Musculoskeletal Tumor Society, or Enneking staging system, can be used to describe the biologic behavior of giant cell tumors.

The stages are based on symptoms, radiographic appearance, biologic activity, and local extent.

Stage I: Latent

Stage I tumors account for fewer than approximately 5% of cases.

They are usually minimally symptomatic or completely asymptomatic and may be discovered incidentally.

Radiographs or CT typically show a lesion with a well-defined sclerotic rim.

The tumor may demonstrate relatively little activity on bone scintigraphy.

Histologically, it remains benign.

Pathologic fracture can occasionally occur.

Stage II: Active

Stage II tumors account for approximately 70–85% of cases.

Patients are usually symptomatic.

The lesion expands the cortex but does not yet clearly break through it.

Bone scintigraphy is generally active.

Pathologic fracture may occur.

Histologically, the tumor remains benign.

Stage III: Aggressive

Stage III tumors represent approximately 10–15% of cases.

They typically present with increasing pain, swelling, and a rapidly enlarging mass.

Imaging demonstrates cortical destruction with extension into surrounding soft tissues.

Bone-scan activity may extend beyond the margins visible on plain radiographs.

The tumor may appear markedly hypervascular on angiographic studies.

Although the lesion remains histologically benign, it demonstrates aggressive local behavior with cortical violation and soft-tissue invasion.

Epidemiology

Age

Peak incidence occurs during the third decade of life, with frequency gradually decreasing thereafter.

The tumor is uncommon after approximately 55 years of age.

Skeletal Maturity

Giant cell tumor almost always develops after closure of the growth plates.

Approximately 10–15% of patients are younger than 20 years, but most of these individuals are already skeletally mature.

Fewer than approximately 2% of giant cell tumors occur adjacent to an open physis.

Therefore, the diagnosis should be reconsidered carefully when a similar lesion occurs in a skeletally immature child.

Frequency

Giant cell tumor accounts for approximately 5% of biopsied primary bone tumors and approximately 20% of benign bone tumors.

It is among the more common primary osseous neoplasms.

Sex

Females are affected slightly more often than males, with reported female-to-male ratios of approximately 1.3–1.5:1.

Risk Factors

Paget disease of bone is a rare predisposing condition.

Etiology

The precise cause of most giant cell tumors is not fully explained by conventional clinical risk factors.

Rare tumors may arise in association with pre-existing Paget disease of bone.

Associated Conditions

Paget Disease

Giant cell tumor can rarely complicate Paget disease.

Such tumors may involve different anatomic sites from conventional giant cell tumor, including the craniofacial skeleton.

Secondary Aneurysmal Bone Cyst

Secondary aneurysmal bone cyst formation is a relatively common associated histologic finding.

These cystic changes can alter the imaging appearance and complicate interpretation.

Diagnosis

Signs and Symptoms

Clinical presentation is often nonspecific.

Because the tumors frequently occur close to joints, patients may initially present with symptoms that resemble primary joint disease.

Pain

Approximately 90% of patients complain of pain.

Pain may be accompanied by localized swelling or a palpable mass.

Pathologic Fracture

Approximately 5–10% of patients present with a pathologic fracture through the weakened bone.

Joint Symptoms

Patients may complain of reduced motion, joint stiffness, or discomfort with weight bearing if the lesion is close to an articular surface.

Physical Examination

There is no pathognomonic physical examination finding.

Localized tenderness is commonly present over the involved epiphyseal region adjacent to a joint.

Swelling

A palpable mass or swelling may develop as the lesion expands.

Joint Effusion and Motion

Joint effusion or restriction of motion may occur when the lesion has substantially weakened or approached the subchondral cortex.

Laboratory Tests

Routine serum chemistry studies are generally normal.

Calcium and Phosphate

Serum calcium and phosphate should be assessed when the differential diagnosis includes hyperparathyroidism.

Evaluation may also include parathyroid hormone testing when clinically appropriate.

This is particularly important because a brown tumor of hyperparathyroidism can histologically and radiographically resemble a giant cell tumor.

Imaging

Plain Radiographs

Radiographs typically show an eccentric, expansile, radiolucent lesion near the end of a long bone.

The lesion is usually sharply defined but often lacks a prominent surrounding rim of reactive sclerosis.

Epiphyseal Involvement

A classic feature is involvement of the epiphysis in a skeletally mature patient.

The tumor commonly extends from the metaphysis toward the subchondral bone and articular surface.

Cortical Expansion

The cortex may become progressively thinned and expanded.

Aggressive lesions may break through the cortex and extend into adjacent soft tissues.

Reactive Sclerosis

Unlike many other benign bone lesions, giant cell tumor typically has little or no reactive sclerosis around its margin.

Spinal Involvement

When the spine is affected, the lesion usually involves the anterior vertebral body.

Multicentric Disease

Multicentric giant cell tumor is rare, occurring in approximately 1% of cases.

Chest Imaging

Chest imaging is appropriate during staging because a small proportion of patients develop pulmonary metastases despite histologically benign primary disease.

Historically, approximately 2% of patients have been reported to develop lung metastases.

Bone Scintigraphy

Bone scans are frequently positive because of increased metabolic activity around the lesion.

However, some lesions may demonstrate relatively little uptake, particularly less active tumors.

Pathological Findings

Microscopically, the tumor consists of a proliferating population of relatively uniform mononuclear stromal cells with numerous multinucleated giant cells distributed evenly throughout the lesion.

Mononuclear Cells

The stromal cells are generally round, oval, epithelioid, or spindle shaped.

They have relatively large nuclei and inconspicuous nucleoli.

These stromal cells represent the neoplastic component of the tumor.

Giant Cells

Multinucleated osteoclast-like giant cells are dispersed relatively uniformly among the mononuclear cells.

Their nuclei often resemble those of the surrounding stromal cells.

Mitotic Activity

Mitotic figures may be frequent, even in histologically benign tumors.

The presence of mitoses alone does not necessarily imply malignant transformation.

Aneurysmal Bone Cyst Component

A secondary aneurysmal bone cyst may be present within the tumor.

Vascular Invasion

Tumor cells may occasionally extend into blood vessels.

Involutional Changes

Some lesions contain lipid-laden histiocytes or other degenerative changes.

Differential Diagnosis

Brown Tumor of Hyperparathyroidism

A brown tumor may closely resemble giant cell tumor histologically and radiographically.

Serum calcium, phosphate, and parathyroid hormone levels help distinguish the two conditions.

Giant Cell Reparative Granuloma

Giant cell reparative granuloma may also contain numerous giant cells but generally has a different clinical setting and histologic organization.

Nonossifying Fibroma

NOF can produce an eccentric lucent lesion but usually occurs in younger patients, is metaphyseal rather than epiphyseal, and typically has a sclerotic border.

Benign Fibrous Histiocytoma

Benign fibrous histiocytoma may share fibrohistiocytic features but usually has a different histologic pattern and distribution.

Aneurysmal Bone Cyst

A primary aneurysmal bone cyst may resemble a giant cell tumor, particularly when secondary aneurysmal cystic change is prominent.

Telangiectatic Osteosarcoma

Telangiectatic osteosarcoma is an important malignant differential diagnosis because it can appear expansile and cystic.

Biopsy and careful histopathologic interpretation are essential.

Treatment

General Principles

Treatment aims to eradicate local disease while preserving the adjacent joint and maintaining limb function whenever possible.

Patients with large lesions at risk for pathologic fracture may be advised to use crutches or protected weight bearing until definitive treatment.

Radiotherapy

Radiotherapy is generally avoided whenever complete surgical treatment is feasible.

Historically, irradiation was associated with an increased risk of secondary malignant transformation.

It is now reserved for uncommon situations in which surgery is not feasible or would carry unacceptable morbidity.

Physical Therapy

Physical therapy is used after treatment to restore joint range of motion, strength, gait, and function.

Surgery

The standard surgical approach for many accessible giant cell tumors consists of extended intralesional curettage.

Curettage

The tumor is removed from the cavity while preserving as much normal bone and articular surface as possible.

High-Speed Burr

A high-speed burr is commonly used to remove microscopic residual tumor from the walls of the cavity and extend the margin of curettage.

Local Adjuvant Treatment

Local adjuvants may be used to reduce residual tumor cells.

Historically, agents such as phenol have been applied to the cavity.

Other modern local adjuvant techniques may also be used depending on surgeon preference and anatomic location.

Polymethylmethacrylate Cement

The resulting cavity may be filled with polymethylmethacrylate (PMMA) bone cement.

Cement provides immediate structural support and facilitates radiographic recognition of recurrent lytic disease at the cement-bone interface.

Bone Grafting

Cancellous or structural bone graft may be used, particularly near the subchondral surface when preservation of the joint is important.

Subchondral Reconstruction

Bone graft can help restore the subchondral region and reduce direct loading of articular cartilage overlying a large defect.

Internal Fixation

Internal fixation may be required when the remaining bone is structurally weak or when there is a pathologic fracture.

Wide Resection

Wide resection may be appropriate when the tumor involves an expendable bone such as the fibula, when there is extensive soft-tissue extension, or when recurrent disease has destroyed the adjacent joint.

Reconstruction

Large periarticular resections may require complex reconstruction.

Around the knee, options may include prosthetic replacement, osteoarticular allograft reconstruction, or arthrodesis, depending on patient factors and extent of disease.

Amputation

Amputation is rarely necessary.

It may be considered for extremely advanced neglected tumors with extensive soft-tissue involvement or for selected uncontrollable recurrent lesions.

Follow-Up

Prognosis

Giant cell tumors have a substantial tendency to recur locally.

Simple Curettage

Historically, recurrence rates after simple curettage alone have been reported as high as 40–60%.

Modern Extended Curettage

With extended curettage using high-speed burring and local adjuvant techniques, recurrence rates are substantially lower, commonly around 10–15%.

Timing of Recurrence

Most recurrences occur within the first 2 years following treatment.

Nearly all are detected within approximately 5 years, although longer surveillance may still be appropriate.

Complications

Local Recurrence

Local recurrence is the most important complication after limb-preserving treatment.

Pathologic Fracture

Structural weakening of bone can produce fracture before treatment or occasionally during follow-up.

Pulmonary Metastasis

A small proportion of histologically benign giant cell tumors metastasize to the lungs.

These metastases may behave relatively indolently but require specialist assessment.

Secondary Malignant Giant Cell Tumor

A secondary malignant giant cell tumor occurs when a sarcoma develops at the site of a previously treated giant cell tumor.

Postirradiation Sarcoma

Historically, approximately 10–15% of irradiated giant cell tumors were reported to develop postirradiation sarcoma in older series.

This risk is one reason radiotherapy is now used very selectively.

Sarcomatous Transformation Without Radiation

Malignant transformation can also occur without previous radiation, particularly in recurrent tumors, but it is uncommon.

Patient Monitoring

Close postoperative surveillance is required because of the risk of recurrence.

Patients may initially be reviewed approximately every 3 months during the first 2 years, with clinical examination and local imaging.

Chest Surveillance

Periodic chest imaging is appropriate because of the small risk of pulmonary metastasis.

Historically, annual chest radiography has been used.

Long-Term Monitoring

Follow-up should assess pain, swelling, joint motion, structural integrity, radiographic evidence of recurrence, pulmonary disease, and complications of reconstruction.

Orthopaedic Surgery - Genu Valgum (Knock-Knee)

Basics

Genu valgum, commonly called knock-knee, describes a lower-extremity alignment in which the knees angle toward one another while the ankles remain separated.

A degree of genu valgum is a normal developmental finding in young children, particularly between approximately 2 and 4 years of age.

Normal Development

Girls normally demonstrate slightly more physiologic valgus than boys.

As growth continues, the valgus gradually decreases, and the lower extremities usually approach the typical adult alignment by approximately 6–7 years of age.

Pathologic Genu Valgum

Persistent or excessive valgus may result from disorders such as rickets, previous trauma, skeletal dysplasia, or genetic abnormalities.

Some children have persistent idiopathic genu valgum without an identifiable underlying disorder.

When substantial valgus persists beyond approximately 7 years of age, it is less likely to represent normal physiologic development.

Anatomic Location

The deformity most commonly arises from altered growth around the knee, particularly involving the distal femoral and proximal tibial physes.

The deformity may originate from the femur, tibia, or both.

Epidemiology

Pathologic genu valgum is uncommon.

The reported incidence is less than approximately 1 per 1,000 children.

Age

Patients requiring evaluation commonly present between approximately 3 and 11 years of age.

Physiologic valgus is most apparent in early childhood.

Sex

Physiologic genu valgum is somewhat more pronounced and more commonly noticed in females than males.

Risk Factors

A family history of genu valgum may increase the likelihood of persistent idiopathic deformity.

Proximal Tibial Metaphyseal Fracture

A proximal tibial metaphyseal fracture in a child, sometimes referred to as a Cozen fracture, can be followed by asymmetric overgrowth and progressive valgus deformity.

Parents should be informed of this possibility, even when the initial fracture heals uneventfully.

Genetics

Several metabolic and skeletal disorders associated with genu valgum have an inherited basis.

Certain forms of rickets are genetic, and idiopathic valgus alignment may also cluster within families.

Etiology

Potential causes include physiologic development, metabolic disease, steroid-related skeletal effects, post-traumatic growth disturbance, skeletal dysplasia, and chromosomal disorders.

Physiologic Genu Valgum

Physiologic genu valgum represents a normal stage of lower-extremity development and generally corrects spontaneously with growth.

Metabolic Disease

Rickets and renal osteodystrophy may weaken the metaphyseal bone and disturb physeal growth, resulting in progressive angular deformity.

Post-Traumatic Deformity

A proximal tibial fracture may lead to asymmetric growth and delayed valgus deformity.

The deformity can appear months after the original injury.

Skeletal Dysplasia

Conditions such as pseudoachondroplasia and metaphyseal dysplasia may produce substantial valgus because of abnormal growth around the knee.

Chromosomal Disorders

Genu valgum may also occur in association with chromosomal conditions such as Klinefelter syndrome or Down syndrome.

Associated Conditions

Important associated disorders include proximal tibial fracture, pseudoachondroplasia, renal osteodystrophy, metaphyseal dysplasia, rickets, Down syndrome, and multiple osteochondromas.

Diagnosis

Signs and Symptoms

The most common reason for presentation is parental concern regarding the appearance of the child’s legs.

Most children with physiologic genu valgum have no pain or functional limitation.

Pain

Childhood genu valgum is usually painless.

Occasionally, excessive valgus may be associated with patellofemoral discomfort or altered patellar tracking.

Adult Symptoms

Persistent severe valgus in adulthood can increase loading across the lateral compartment of the knee and may contribute to lateral compartment osteoarthritis and patellofemoral symptoms.

Physical Examination

Range of Motion

Knee range of motion should be assessed and compared bilaterally.

Associated flexion contracture, hyperextension, or rotational abnormality should be documented.

Growth Assessment

Height and weight should be measured and plotted against age-appropriate growth charts.

Short stature or abnormal growth patterns may suggest skeletal dysplasia, endocrine disease, or another systemic disorder.

Femorotibial Angle

The angle between the femoral and tibial axes can be measured clinically using a goniometer.

This provides an estimate of the degree of valgus.

Intermalleolar Distance

With the patient standing and the knees touching, the distance between the medial malleoli is measured.

An increased intermalleolar distance reflects greater valgus deformity.

Adjacent Joints

The hips and ankles should also be examined because deformity or contracture at these levels may alter apparent knee alignment.

Rotational Profile

Femoral and tibial rotation should be assessed.

Rotational abnormalities may exaggerate or mask the appearance of genu valgum.

Gait

The patient’s gait should be observed for abnormal alignment, circumduction, instability, or patellar maltracking.

Ligament Examination

The medial and lateral collateral ligaments should be tested for laxity.

Ligamentous instability may contribute to apparent or progressive valgus alignment.

Laboratory Tests

Laboratory testing is unnecessary for typical physiologic genu valgum.

It is indicated when a metabolic or endocrine disorder is suspected.

Evaluation for Rickets or Metabolic Bone Disease

Potential studies include serum calcium, phosphate, alkaline phosphatase, blood urea nitrogen, creatinine, and vitamin D levels.

Vitamin D Assessment

When evaluating rickets, measurement of 25-hydroxyvitamin D is particularly useful.

Additional studies, including 1,25-dihydroxyvitamin D and renal or endocrine investigations, may be obtained depending on the suspected cause.

Hypophosphatemic Rickets

Familial hypophosphatemic rickets is an important inherited cause of progressive lower-extremity deformity.

Serum phosphate and related metabolic studies are therefore important when this condition is suspected.

Imaging

When Imaging Is Unnecessary

Routine radiographs are generally unnecessary in children younger than approximately 6 years when the genu valgum is symmetric, painless, and clearly physiologic.

Indications for Imaging

Imaging should be obtained when the deformity is asymmetric, severe, progressive, painful, persistent beyond the expected age, associated with short stature, or accompanied by suspicion of metabolic or skeletal disease.

Standing Long-Leg Radiograph

The preferred initial study is a standing AP radiograph of the entire lower extremity from hip to ankle.

The patella should face directly forward to minimize rotational error.

Femorotibial Angle

The radiograph allows measurement of the femorotibial angle and helps determine whether the deformity arises primarily from the distal femur, proximal tibia, or both.

Mechanical Axis

The mechanical axis of the lower extremity should be assessed.

In normal alignment, a line from the center of the femoral head toward the center of the ankle passes near the central portion of the knee.

Increasing lateral displacement indicates worsening genu valgum.

Differential Diagnosis

The principal diagnostic task is distinguishing physiologic valgus from pathologic valgus.

It is also important to determine whether the deformity is developmental or acquired.

Physiologic Genu Valgum

Physiologic genu valgum occurs without evidence of rickets, skeletal dysplasia, trauma, tumor, or other disease and improves spontaneously with growth.

Skeletal Dysplasia

Important skeletal dysplasias associated with valgus include metaphyseal dysplasia, pseudoachondroplasia, and multiple osteochondromas.

Developmental Causes

Developmental causes include physiologic valgus, idiopathic persistent genu valgum, and skeletal dysplasia.

Acquired Causes

Acquired causes include metabolic disease, post-traumatic growth disturbance, and neoplastic or other physeal disorders.

Treatment

Physiologic Genu Valgum

No treatment is required for physiologic genu valgum in children younger than approximately 7 years of age when the deformity is symmetric and within normal developmental limits.

Reassurance and observation are usually sufficient.

Persistent Idiopathic Genu Valgum

If substantial deformity persists beyond approximately 7 years of age, continued observation may be appropriate until the child approaches an age at which guided growth could be considered.

Surgical treatment is generally reserved for persistent, progressive, or symptomatic deformity.

Pathologic Valgus

The underlying disorder should be addressed before or together with correction of the angular deformity.

Metabolic Disease

In patients with renal osteodystrophy, rickets, or another metabolic condition, medical control of the underlying disease is essential.

Management often requires coordination with an endocrinologist or nephrologist.

Bracing

Bracing has not been shown to reliably correct or prevent progression of structural genu valgum.

Osteotomy

Severe deformity associated with skeletal dysplasia or metabolic disease may require one or more corrective osteotomies once the underlying disease has been adequately controlled.

Post-Traumatic Valgus

Children with proximal tibial metaphyseal fractures should be followed for several years because valgus deformity can develop after apparent fracture healing.

Early Osteotomy

Early corrective tibial osteotomy is generally avoided because post-traumatic valgus may spontaneously improve and early osteotomy has historically been associated with recurrence.

Persistent Deformity

If unacceptable valgus remains after approximately 1–2 years of observation, guided growth or corrective osteotomy may be considered depending on remaining growth and severity.

Skeletal Dysplasia

Children with pseudoachondroplasia or metaphyseal dysplasia may develop progressive valgus.

Corrective osteotomy or guided growth may be required when the deformity becomes substantial or symptomatic.

Activity

No routine activity restrictions are required for physiologic genu valgum.

Children may participate in normal play and sports unless another underlying disorder requires limitation.

Physical Therapy

Physical therapy does not alter physeal growth or correct structural genu valgum.

Exercises therefore do not change the natural history of the deformity.

Therapy may still be useful for associated weakness or postoperative rehabilitation.

Surgery

The two principal surgical strategies are hemiepiphysiodesis and corrective varus osteotomy.

Hemiepiphysiodesis

Hemiepiphysiodesis is a guided-growth procedure used in skeletally immature children with sufficient growth remaining.

Principle

Growth on the medial side of the distal femoral or proximal tibial physis is temporarily slowed, allowing continued growth on the lateral side to gradually correct the valgus.

Techniques

Guided growth may be achieved using staples, transphyseal screws, or plate-and-screw tension-band devices.

Indications

Hemiepiphysiodesis may be considered when the mechanical axis passes markedly lateral to the knee, particularly into the lateral-most zones of the tibial plateau.

Pain combined with significant mechanical-axis deviation may also support intervention.

Advantages

The procedure is relatively minimally invasive, does not substantially weaken the bone, and usually allows early weight bearing.

Goal

The objective is to achieve satisfactory mechanical alignment by the time skeletal growth is completed.

Careful timing and follow-up are necessary to avoid overcorrection.

Corrective Osteotomy

Osteotomy is preferred when immediate correction is required or insufficient growth remains for guided growth to work effectively.

Procedure

The involved bone is divided, realigned into a more neutral or varus position, and stabilized with internal fixation.

The osteotomy may be performed at the distal femur, proximal tibia, or both depending on the site of deformity.

Recovery

Recovery is more demanding than after hemiepiphysiodesis because the bone is completely divided and must heal before unrestricted activity.

Surgical Success

Appropriately selected surgical correction has an overall success rate greater than approximately 90%.

Follow-Up

Prognosis

Physiologic genu valgum has an excellent prognosis and usually resolves as growth continues.

Mild deformity, particularly valgus less than approximately 15°, often improves by approximately 7–10 years of age when no metabolic or skeletal disorder is present.

Complications of Untreated Genu Valgum

Severe persistent valgus may cause patellofemoral pain, abnormal patellar tracking, gait disturbance, and increased loading of the lateral compartment of the knee.

Over many years, this can contribute to degenerative arthritis.

Surgical Complications

Potential complications include infection, compartment syndrome, neurovascular injury, recurrent deformity, and overcorrection into genu varum.

Guided-growth procedures additionally require careful monitoring to prevent excessive correction.

Patient Monitoring

Children with idiopathic genu valgum can generally be followed at approximately 12–24-month intervals while spontaneous improvement is expected.

Follow-up should document intermalleolar distance, femorotibial angle, gait, mechanical-axis alignment, symmetry, pain, growth, and progression or improvement of the deformity.

Orthopaedic Surgery - Friedreich Ataxia

Basics

Friedreich ataxia is an uncommon inherited neurodegenerative disorder characterized by progressive degeneration of the spinal cord and peripheral nervous system, with prominent involvement of coordination and gait.

The musculoskeletal manifestations most frequently encountered are scoliosis and cavovarus foot deformity, while progressive ataxia represents the major neurologic feature.

Systems Involved

Friedreich ataxia primarily affects the central and peripheral nervous systems, cardiovascular system, and musculoskeletal system.

Endocrine abnormalities, particularly diabetes mellitus, may also occur.

Classification

There are no major orthopaedic subclassifications of Friedreich ataxia.

It belongs to the broader group of hereditary ataxic or spinocerebellar degenerative disorders.

Epidemiology

Friedreich ataxia is rare.

Older estimates placed its prevalence at approximately 1 in 50,000 individuals, while more recent molecularly based estimates have suggested a prevalence closer to 1 in 29,000 in some populations.

Age at Presentation

Symptoms most commonly become apparent between approximately 5 and 25 years of age.

Earlier onset is generally associated with more severe and rapidly progressive disease.

Sex

Males and females are affected approximately equally.

Population Distribution

The condition is more common in populations of European ancestry and has historically been reported with increased frequency in some French-Canadian populations.

Genetics

Friedreich ataxia is inherited in an autosomal recessive pattern.

Affected individuals generally inherit a pathogenic allele from each parent.

Frataxin Gene

The disorder is caused by pathogenic changes involving the FXN gene on chromosome 9, which encodes the mitochondrial protein frataxin.

GAA Trinucleotide Repeat

The most common genetic abnormality is expansion of a GAA trinucleotide repeat within the FXN gene.

This reduces expression of frataxin.

Relationship to Disease Severity

In general, larger GAA repeat expansions are associated with earlier onset and more severe disease, although clinical variability is considerable.

Frataxin Function

Frataxin is a mitochondrial protein involved in cellular iron handling and normal mitochondrial energy metabolism.

Loss of adequate frataxin function contributes to oxidative injury and progressive neurologic and cardiac dysfunction.

Associated Conditions

Important associated conditions include hypertrophic cardiomyopathy, diabetes mellitus, scoliosis, and cavovarus deformity of the feet.

Diagnosis

The diagnosis is established primarily through molecular genetic testing identifying pathogenic variants in the FXN gene.

Historically, diagnosis relied more heavily on clinical manifestations and neurophysiologic findings.

Clinical Features

Classic Neurologic Findings

A characteristic clinical combination includes:

Progressive ataxia, loss or reduction of deep tendon reflexes, and an extensor plantar response or Babinski sign.

Ataxia

Progressive impairment of coordination affects standing, walking, and fine motor tasks.

Gait becomes broad-based and unstable as disease advances.

Areflexia

Deep tendon reflexes, particularly in the lower extremities, are commonly reduced or absent because of peripheral nerve involvement.

Babinski Sign

Despite reduced peripheral reflexes, corticospinal tract disease may produce an extensor plantar response.

Additional Signs

Other findings may include pes cavus or cavovarus feet, optic atrophy, nystagmus, abnormal electrocardiographic findings, scoliosis, and kyphosis.

Symptoms

Patients may experience progressive loss of coordination, weakness, painful muscle spasms, hearing impairment, fatigue, and depression.

Symptoms related to diabetes mellitus may also occur when endocrine involvement is present.

Physical Examination

Gait and Coordination

Gait should be observed carefully.

Tandem, or heel-to-toe, walking is useful for demonstrating impaired balance and coordination.

The finger-to-nose test can assess upper-extremity dysmetria and cerebellar dysfunction.

Spine Examination

Standing alignment should be assessed for excessive kyphosis and scoliosis.

The forward-bend test is useful for detecting rotational prominence associated with scoliosis.

Reflexes

Upper- and lower-extremity deep tendon reflexes should be documented.

Plantar responses should also be assessed.

Foot Examination

The feet should be evaluated for cavus, hindfoot varus, equinus, clawing of the toes, calluses, and skin pressure areas.

The examiner should determine whether the deformity remains flexible or has become rigid.

Muscle Strength

Muscle strength should be documented throughout the upper and lower extremities.

Weakness progresses with disease and ultimately contributes substantially to loss of ambulation.

Laboratory Tests

Creatine Kinase

Creatine phosphokinase or creatine kinase levels are generally normal, helping distinguish Friedreich ataxia from some primary muscular dystrophies.

Glucose Testing

Fasting serum glucose or other appropriate diabetic screening should be obtained because of the increased prevalence of diabetes mellitus.

Cardiac Assessment

Because cardiomyopathy is common, cardiac evaluation is important.

An electrocardiogram should be obtained before major surgery, and echocardiography should be performed when clinically indicated.

Cardiomyopathy

Hypertrophic cardiomyopathy is an important cause of morbidity and mortality and substantially influences perioperative planning.

Electrodiagnostic Testing

Electromyography may demonstrate polyphasic potentials.

Nerve conduction studies can show mild slowing or other evidence of peripheral neuropathy.

Imaging

Spine Radiographs

Standing posteroanterior and lateral radiographs of the spine should be obtained when scoliosis or kyphosis is identified.

Long-Term Spinal Surveillance

Spinal deformity can continue to progress even after skeletal maturity.

Periodic radiographic monitoring is therefore appropriate in patients with established scoliosis.

Foot Radiographs

Weight-bearing radiographs of the feet may be useful when cavovarus deformity is substantial, progressive, painful, or being considered for surgery.

Differential Diagnosis

Cerebellar Tumor

Intracranial lesions affecting the cerebellum may produce ataxia and should be considered when the presentation is atypical or asymmetric.

Chiari Malformation

Chiari malformation can produce neurologic abnormalities, gait disturbance, and scoliosis.

Muscular Dystrophy

Muscular dystrophies may produce progressive weakness and spinal deformity but have a different neurologic and laboratory profile.

Spinal Dysraphism

Spinal dysraphism can produce scoliosis, cavus foot deformity, weakness, and abnormal reflexes and should be considered in the differential diagnosis.

Treatment

General Principles

Management is multidisciplinary because the disorder affects neurologic, cardiac, endocrine, and musculoskeletal systems.

Orthopaedic care focuses primarily on preserving ambulation, maintaining plantigrade feet, treating painful deformity, and monitoring scoliosis.

Orthopaedic Surveillance

Foot and spinal deformities should be monitored by an orthopaedic surgeon even when surgery is not currently planned.

Progression may occur relatively rapidly, particularly in patients with early-onset disease.

Ambulation

Walking should be maintained safely for as long as possible.

Bracing, assistive devices, therapy, and correction of severe deformity can help preserve mobility.

Foot Deformity

Stretching and nighttime positioning or bracing may help delay progression of flexible cavovarus and equinus deformities.

The aim is to maintain a painless, braceable, plantigrade foot.

Scoliosis Bracing

For scoliosis measuring approximately 25–45°, bracing may be attempted in selected patients.

Bracing may slow progression but is less reliable at permanently controlling the curve than in idiopathic scoliosis.

Physical Therapy

Physical therapy is important for maintaining strength, balance, mobility, joint range of motion, transfers, and functional independence.

It is also essential after orthopaedic surgery.

Stretching

Regular stretching of the plantar fascia, Achilles tendon, and ankle musculature may help delay fixed cavovarus and equinus deformity.

Medication

Medical treatment is primarily directed by neurology and other relevant specialists.

Symptomatic medications may be required for associated problems.

Muscle Spasms

Painful spasticity or muscle spasms may be treated with medications such as baclofen or diazepam in selected patients.

Scoliosis Surgery

Preoperative Evaluation

Because of the high prevalence of cardiomyopathy and potential respiratory impairment, a detailed cardiopulmonary assessment is required before major spinal surgery.

Risk of Progression

Rapid scoliosis progression is particularly associated with onset of Friedreich ataxia before approximately 10 years of age and development of scoliosis before approximately 15 years.

Surgical Indications

Severe progressive curves, particularly those exceeding approximately 60°, often require posterior spinal fusion and instrumentation to prevent further deformity and loss of trunk balance.

Curves of 40–60°

Curves between approximately 40° and 60° require individualized treatment.

Factors include rate of progression, skeletal maturity, neurologic status, sitting or standing balance, pulmonary function, and overall medical condition.

Bracing or surgery may be appropriate depending on these factors.

Fusion Levels

Fusion frequently extends across a long segment of the thoracic and lumbar spine because deformity may be extensive and progressive.

Modern segmental instrumentation is used to obtain correction and stability.

Severe Rigid Curves

Large, rigid, or markedly unbalanced deformities may require additional techniques to improve flexibility and correction.

Historically, anterior release procedures were sometimes used, although contemporary approaches depend on individual anatomy and modern posterior techniques.

Spinal Cord Monitoring

Intraoperative neuromonitoring may be technically challenging because baseline neurologic abnormalities are common.

Both sensory and motor modalities should be used when feasible.

Postoperative Immobilization

Routine external postoperative immobilization is generally unnecessary after stable modern internal fixation.

Cavovarus Foot Surgery

Surgery is considered when the deformity becomes painful, progressive, rigid, poorly braceable, or interferes with standing and walking.

Soft-Tissue Procedures

Flexible deformities may require procedures such as Achilles tendon lengthening and tendon balancing or transfer.

Posterior tibial tendon procedures may be incorporated when its deforming force contributes to cavovarus.

Arthrodesis

Rigid severe deformities may require fusion procedures, including triple arthrodesis, to obtain a stable plantigrade foot.

Follow-Up

Specialist Coordination

A neurologist is generally best positioned to coordinate overall disease management, with input from orthopaedics, cardiology, endocrinology, rehabilitation medicine, physical therapy, and other specialists.

Prognosis

Friedreich ataxia is a progressive disorder.

The clinical course varies according to age of onset, genetic findings, cardiac involvement, and severity of neurologic disease.

Scoliosis Prognosis

Scoliosis developing before approximately 15 years of age is more likely to become severe and may ultimately require operative correction.

Ambulation

Progressive neurologic deterioration commonly leads to loss of independent walking.

Historically, many affected individuals became wheelchair dependent during the second or third decade of life, although progression varies substantially among patients.

Survival

Cardiomyopathy and respiratory complications are major determinants of long-term survival.

Historically, severe disease was associated with reduced life expectancy, although contemporary multidisciplinary management continues to improve supportive care.

Complications

Cardiomyopathy

Cardiac involvement is one of the most important systemic complications and can lead to arrhythmia or heart failure.

Foot Skin Problems

Cavovarus deformity may create abnormal pressure points, producing calluses, painful keratoses, or skin breakdown.

Respiratory Complications

Progressive neuromuscular weakness, scoliosis, and impaired swallowing may increase the risk of pneumonia and aspiration.

Progressive Loss of Mobility

Weakness, ataxia, contracture, and deformity progressively reduce walking endurance and may ultimately result in wheelchair dependence.

Patient Monitoring

Because Friedreich ataxia is progressive, patients require regular multidisciplinary follow-up.

Walking distance, muscle strength, coordination, foot alignment, skin condition, and overall functional status may be reassessed approximately every 3–6 months, depending on severity.

Scoliosis Monitoring

Once scoliosis is identified, clinical and radiographic assessment approximately every 6 months is appropriate during periods of growth or documented progression.

Long-term surveillance may remain necessary after skeletal maturity because curves can continue to worsen.

Orthopaedic Surgery - Freiberg Disease (Freiberg Infraction)

Basics

Freiberg disease, also called Freiberg infraction, is an osteochondrosis or osteonecrotic disorder involving the metatarsal head, most commonly the second metatarsal head.

It typically presents in an adolescent, young adult, or occasionally middle-aged adult with well-localized pain at the second metatarsophalangeal (MTP) joint that worsens with activity and improves with rest.

Anatomic Distribution

The second metatarsal head is affected most frequently.

The third or other lesser metatarsal heads may occasionally be involved.

Disease may be unilateral or bilateral.

Disease Progression

The disorder progresses through a spectrum of subchondral injury, necrosis, collapse, and eventually degenerative arthritis.

Early radiographs may demonstrate subtle mottling, sclerosis, or central subchondral collapse.

Moderate disease produces flattening or collapse of the metatarsal head, often accompanied by osteophytes or loose osteochondral fragments.

Advanced disease is characterized by joint-space loss, articular destruction, and secondary MTP arthritis.

Epidemiology

Freiberg disease occurs more commonly in females than males.

The true incidence is uncertain because some cases remain asymptomatic and are discovered incidentally on radiographs.

Age

The condition is classically diagnosed during adolescence, especially between approximately 13 and 18 years of age, although symptoms may persist into adulthood or first become clinically apparent later.

Risk Factors

Important associations include running, dancing, repetitive forefoot loading, and a relatively long second metatarsal.

These factors increase mechanical stress across the affected metatarsal head.

Etiology

The exact cause is likely multifactorial.

Freiberg disease is characterized by compromise of the subchondral bone and blood supply of the metatarsal head, resulting in osteonecrosis and structural collapse.

Vascular Factors

Impaired local microcirculation has been proposed as an important contributor to the development of osteonecrosis.

Acute Trauma

A single traumatic event may damage the subchondral bone or vascular supply and initiate the disease process in some patients.

Repetitive Microtrauma

Repeated forefoot loading from running, jumping, dancing, or other high-impact activity may produce cumulative microtrauma.

Second Metatarsal Anatomy

The second metatarsal is often the longest metatarsal and is relatively rigidly fixed at its base.

These characteristics can subject the second metatarsal head to increased repetitive loading and may explain why it is affected most frequently.

Diagnosis

Signs and Symptoms

The characteristic complaint is pain localized to the second MTP joint.

Pain is aggravated by walking, running, sports, and other weight-bearing activity and generally improves with rest.

Swelling

Localized swelling or soft-tissue thickening may develop around the involved MTP joint.

Swelling may become more noticeable after prolonged activity.

Stiffness

As disease progresses, the affected MTP joint may lose motion because of synovitis, articular collapse, osteophytes, or secondary arthritis.

Physical Examination

Range of Motion

The involved MTP joint may demonstrate reduced active and passive range of motion.

Motion can become progressively restricted in later stages.

Tenderness

Direct palpation over the metatarsal head and MTP joint typically reproduces the patient’s pain.

Swelling

Soft-tissue swelling around the joint may be present, particularly after activity.

Toe-Rise Test

Standing on the toes or performing a heel rise increases loading across the metatarsal heads and may reproduce pain.

Imaging

Plain Radiographs

Initial evaluation should include weight-bearing AP, oblique, and lateral radiographs of the foot.

Radiographic appearance varies according to the stage of disease.

Early Radiographic Findings

Early findings may include localized osteopenia, subtle subchondral lucency, sclerosis, or irregularity of the metatarsal head.

Radiographs can occasionally appear normal in very early disease.

Progressive Disease

With progression, the metatarsal head may become enlarged, flattened, sclerotic, and irregular.

Subchondral cystic changes and osteophytes may also develop.

End-Stage Disease

Advanced disease produces joint-space narrowing, fragmentation, deformity, and degenerative destruction of the MTP joint.

MRI

MRI is particularly useful when early disease is suspected but radiographs are normal or equivocal.

Typical findings include bone marrow edema and abnormalities of the subchondral bone consistent with osteonecrosis or osteochondral injury.

Bone Scintigraphy

Technetium bone scanning can demonstrate focal increased tracer uptake at the involved metatarsal head.

It may help identify occult disease, although MRI is generally more useful for defining early structural abnormalities.

Pathological Findings

Characteristic pathologic changes include synovitis, loose bodies, osteophytes, and osteonecrosis of the metatarsal head.

Metatarsal Head Necrosis

The marrow space may undergo fibrosis with areas of dead trabecular bone.

Subsequent resorption and structural weakening can lead to collapse of the articular surface.

Cartilage Damage

Progressive disease eventually results in articular cartilage loss and secondary degenerative arthritis.

Classification

Several classification systems have been proposed.

The best known is the Smillie classification, which describes progressive stages based largely on the structural and macroscopic appearance of the metatarsal head.

Although useful for describing severity, the classification does not always determine treatment reliably by itself.

Natural History

Freiberg disease may progress through stages of subchondral necrosis, collapse, remodeling, and secondary arthritis.

In some patients, remodeling ultimately produces a reasonably congruent articular surface and substantial improvement in pain.

Others develop persistent deformity or degenerative arthritis.

Differential Diagnosis

Idiopathic Synovitis

MTP synovitis can produce localized pain and swelling without the characteristic osseous abnormalities of Freiberg disease.

Inflammatory Arthritis

Inflammatory arthropathies may cause forefoot pain, swelling, stiffness, and multiple-joint involvement.

Acute Fracture

An acute metatarsal or osteochondral fracture should be considered when symptoms follow trauma.

MTP Sprain

Ligamentous injury around the MTP joint can produce pain and swelling without metatarsal head osteonecrosis.

Metatarsal Stress Fracture

A stress fracture may cause activity-related forefoot pain and focal tenderness and can resemble early Freiberg disease.

Morton Neuroma

Morton neuroma produces forefoot pain, often with burning or paresthesias radiating into the toes, typically from an intermetatarsal space rather than directly from the metatarsal head.

Treatment

General Principles

Treatment depends on the stage of disease, severity of pain, degree of articular collapse, and functional limitation.

Early disease is generally treated nonoperatively.

Activity Modification

Activities that reproduce pain should be reduced or temporarily avoided.

This commonly includes running, jumping, dancing, and other high-impact loading of the forefoot.

Immobilization and Footwear

Early-stage disease may be treated with a stiff-soled shoe, walking boot, or short walking cast to decrease motion and loading across the involved MTP joint.

Metatarsal Pad

A metatarsal pad placed just proximal to the affected metatarsal head can redistribute plantar pressure away from the painful joint.

Taping

Taping or strapping the involved toe can limit MTP motion and reduce mechanical irritation.

Medication

NSAIDs may be used to reduce pain and inflammatory swelling when appropriate.

Corticosteroid Injection

A carefully selected intra-articular corticosteroid injection may temporarily reduce symptomatic synovitis.

Such injections should be used judiciously and do not correct the underlying structural abnormality.

Surgery

Surgery is considered when substantial symptoms persist despite appropriate nonoperative treatment, particularly in patients with progressive collapse or mechanical joint symptoms.

Synovectomy

Synovectomy can be performed when persistent inflammatory synovitis contributes significantly to pain.

Joint Debridement

Debridement may include removal of fibrotic tissue, loose osteochondral bodies, and osteophytes.

This can improve motion and reduce mechanical symptoms.

Bone Grafting

Bone grafting of the metatarsal head may be considered in selected earlier-stage lesions when the subchondral bone is compromised but the articular surface has not yet undergone major collapse.

Dorsiflexion Osteotomy

A dorsiflexion osteotomy of the affected metatarsal can rotate relatively healthy plantar articular cartilage dorsally so that it articulates with the proximal phalanx.

This simultaneously unloads the damaged dorsal portion of the metatarsal head.

Resection Arthroplasty

Metatarsal head resection arthroplasty may be considered for severe end-stage disease in selected patients.

However, shortening and loss of the metatarsal head can alter forefoot load distribution.

Prosthetic Joint Replacement

Routine prosthetic replacement of the lesser MTP joint is generally not favored.

Potential problems include transfer metatarsalgia, bone resorption, loosening, and implant failure.

Follow-Up

Prognosis

The prognosis is generally favorable.

In many patients, the acute painful phase gradually resolves and is replaced by only an intermittent ache or mild activity-related discomfort.

Long-Term Outcome

Outcome depends on the degree of articular collapse and secondary arthritis.

Patients treated before extensive joint destruction generally have better preservation of motion and function.

Complications

Articular Collapse

Progressive subchondral failure can lead to flattening and collapse of the metatarsal head.

MTP Arthritis

Loss of joint congruity and cartilage can result in secondary degenerative arthritis of the second MTP joint.

Transfer Metatarsalgia

As the painful joint becomes mechanically unloaded, pressure may shift to adjacent metatarsal heads.

This can produce transfer metatarsalgia and plantar callus formation elsewhere in the forefoot.

Patient Monitoring

Patients should be monitored for pain, swelling, MTP range of motion, progression of metatarsal head collapse, development of arthritis, and ability to return to activity.

Repeat weight-bearing radiographs are useful when symptoms persist or worsen, particularly to assess structural progression and guide the need for operative treatment.